diff --git a/src/modules/exams/actions.ts b/src/modules/exams/actions.ts
index b212168..8a2b79c 100644
--- a/src/modules/exams/actions.ts
+++ b/src/modules/exams/actions.ts
@@ -19,6 +19,7 @@ import {
   getExamGrades,
   getExamPreview,
   getExamSubjects,
+  getExamsByGradeId,
   persistAiGeneratedExamDraft,
   persistExamDraft,
   resolveSubjectGradeNames,
@@ -39,6 +40,7 @@ import type {
   AiPreviewData,
   AiRewriteQuestionData,
 } from "./ai-pipeline"
+import type { GradeExamsResult } from "./types"
 export type { AiPreviewData, AiRewriteQuestionData } from "./ai-pipeline"
 
 const ExamCreateSchema = z.object({
@@ -850,4 +852,30 @@ export async function getGradesAction(): Promise<ActionState<{ id: string; name:
   }
 }
 
+/**
+ * 年级仪表盘 - 维度3：获取年级下所有考试 + 提交统计。
+ */
+export async function getExamsByGradeIdAction(
+  gradeId: string
+): Promise<ActionState<GradeExamsResult>> {
+  try {
+    const ctx = await requirePermission(Permissions.EXAM_READ)
+
+    if (!gradeId || gradeId.trim().length === 0) {
+      return failState<GradeExamsResult>("Invalid grade id")
+    }
+
+    const result = await getExamsByGradeId({
+      gradeId,
+      scope: ctx.dataScope,
+    })
+    return successState(result)
+  } catch (error) {
+    if (error instanceof PermissionDeniedError) {
+      return failState<GradeExamsResult>(error.message)
+    }
+    return handleActionError(error)
+  }
+}
+
 
diff --git a/src/modules/exams/components/exam-ai-generator.tsx b/src/modules/exams/components/exam-ai-generator.tsx
index 497bff3..6f3131e 100644
--- a/src/modules/exams/components/exam-ai-generator.tsx
+++ b/src/modules/exams/components/exam-ai-generator.tsx
@@ -2,8 +2,6 @@
 
 import type { Control, UseFormReturn } from "react-hook-form"
 import { useTranslations } from "next-intl"
-import Link from "next/link"
-import { Settings } from "lucide-react"
 import {
   FormField,
   FormItem,
@@ -86,15 +84,7 @@ export function ExamAiGenerator({
           name="aiProviderId"
           render={({ field }) => (
             <FormItem>
-              <div className="flex items-center justify-between gap-2">
-                <FormLabel>{t("provider.label")}</FormLabel>
-                <Button asChild type="button" variant="ghost" size="sm" className="h-7 px-2 text-muted-foreground hover:text-foreground">
-                  <Link href="/admin/ai-settings">
-                    <Settings className="mr-1 h-3.5 w-3.5" />
-                    {t("provider.manage")}
-                  </Link>
-                </Button>
-              </div>
+              <FormLabel>{t("provider.label")}</FormLabel>
               <Select value={field.value} onValueChange={field.onChange} disabled={loadingAiProviders}>
                 <FormControl>
                   <SelectTrigger>
diff --git a/src/modules/exams/data-access-error-collection.ts b/src/modules/exams/data-access-error-collection.ts
new file mode 100644
index 0000000..56ffe06
--- /dev/null
+++ b/src/modules/exams/data-access-error-collection.ts
@@ -0,0 +1,94 @@
+import "server-only"
+
+import { and, eq } from "drizzle-orm"
+
+import { db } from "@/shared/db"
+import { examQuestions, examSubmissions, exams, submissionAnswers } from "@/shared/db/schema"
+
+/**
+ * 错题采集所需的答案数据（单题）
+ */
+export type AnswerForErrorCollection = {
+  questionId: string
+  answerContent: unknown
+  score: number | null
+  feedback: string | null
+  maxScore: number
+}
+
+/**
+ * 考试提交的错题采集数据
+ */
+export type ExamSubmissionDataForErrorCollection = {
+  examId: string
+  subjectId: string | null
+  answers: AnswerForErrorCollection[]
+}
+
+/**
+ * 跨模块接口：获取考试提交的错题采集数据。
+ *
+ * 供 error-book 模块调用，避免 error-book 直接查询 examSubmissions、
+ * submissionAnswers、examQuestions、exams 等属于 exams 模块的表。
+ *
+ * 返回该提交的所有答案（含得分、反馈、满分），由 error-book 模块
+ * 自行筛选错题（score < maxScore）并采集。
+ *
+ * @param submissionId 考试提交 ID
+ * @param studentId 学生 ID（用于校验提交归属）
+ * @returns 提交数据；若提交不存在或 studentId 不匹配则返回 null
+ */
+export async function getExamSubmissionDataForErrorCollection(
+  submissionId: string,
+  studentId: string,
+): Promise<ExamSubmissionDataForErrorCollection | null> {
+  const submission = await db.query.examSubmissions.findFirst({
+    where: and(
+      eq(examSubmissions.id, submissionId),
+      eq(examSubmissions.studentId, studentId),
+    ),
+    columns: { id: true, examId: true },
+  })
+
+  if (!submission) return null
+
+  // 并行获取考试学科、提交答案、题目满分
+  const [exam, answers, examQuestionScores] = await Promise.all([
+    db.query.exams.findFirst({
+      where: eq(exams.id, submission.examId),
+      columns: { subjectId: true },
+    }),
+    db
+      .select({
+        questionId: submissionAnswers.questionId,
+        answerContent: submissionAnswers.answerContent,
+        score: submissionAnswers.score,
+        feedback: submissionAnswers.feedback,
+      })
+      .from(submissionAnswers)
+      .where(eq(submissionAnswers.submissionId, submissionId)),
+    db
+      .select({
+        questionId: examQuestions.questionId,
+        maxScore: examQuestions.score,
+      })
+      .from(examQuestions)
+      .where(eq(examQuestions.examId, submission.examId)),
+  ])
+
+  const maxScoreMap = new Map(examQuestionScores.map((q) => [q.questionId, q.maxScore ?? 0]))
+
+  const mappedAnswers: AnswerForErrorCollection[] = answers.map((a) => ({
+    questionId: a.questionId,
+    answerContent: a.answerContent,
+    score: a.score,
+    feedback: a.feedback,
+    maxScore: maxScoreMap.get(a.questionId) ?? 0,
+  }))
+
+  return {
+    examId: submission.examId,
+    subjectId: exam?.subjectId ?? null,
+    answers: mappedAnswers,
+  }
+}
diff --git a/src/modules/exams/data-access.ts b/src/modules/exams/data-access.ts
index 2dd3f6c..1888384 100644
--- a/src/modules/exams/data-access.ts
+++ b/src/modules/exams/data-access.ts
@@ -1,6 +1,6 @@
 import { db } from "@/shared/db"
-import { exams, examQuestions, examSubmissions, submissionAnswers } from "@/shared/db/schema"
-import { count, eq, desc, like, and, or, inArray } from "drizzle-orm"
+import { exams, examQuestions, examSubmissions, submissionAnswers, questions } from "@/shared/db/schema"
+import { count, eq, desc, like, and, or, inArray, asc, type SQL } from "drizzle-orm"
 import { cache } from "react"
 import { createId } from "@paralleldrive/cuid2"
 import { createQuestionWithRelations } from "@/modules/questions/data-access"
@@ -8,7 +8,7 @@ import { getClassGradeIdsByClassIds } from "@/modules/classes/data-access"
 import { getSubjectNameById, getGradeNameById, getSubjectOptions, getGradeOptions } from "@/modules/school/data-access"
 import { escapeLikePattern } from "@/shared/lib/action-utils"
 
-import type { Exam, ExamDifficulty, ExamStatus } from "./types"
+import type { Exam, ExamDifficulty, ExamStatus, GradeExamsResult, GradeExamItem, ExamForGradeEntry, ExamOptionForEntry } from "./types"
 import type { AiGeneratedQuestion, AiGeneratedStructureNode } from "./ai-pipeline"
 import type { DataScope } from "@/shared/types/permissions"
 
@@ -786,3 +786,248 @@ export const addExamQuestions = async (
     }))
   )
 }
+
+/**
+ * 年级仪表盘 - 维度3：获取年级下所有考试 + 提交统计。
+ * exams 表有直接 gradeId 字段，配合 examSubmissions 聚合提交数/已评分数/平均分。
+ */
+export const getExamsByGradeId = cache(
+  async (params: { gradeId: string; scope: DataScope }): Promise<GradeExamsResult> => {
+    const conditions: SQL[] = [eq(exams.gradeId, params.gradeId)]
+
+    // scope 过滤
+    if (params.scope.type === "owned") {
+      conditions.push(eq(exams.creatorId, params.scope.userId))
+    }
+    if (params.scope.type === "grade_managed") {
+      if (params.scope.gradeIds.length === 0) {
+        conditions.push(eq(exams.id, "__none__"))
+      } else {
+        // grade_managed 且当前 gradeId 在管辖范围内才可见
+        if (!params.scope.gradeIds.includes(params.gradeId)) {
+          return {
+            gradeId: params.gradeId,
+            exams: [],
+            totals: { examCount: 0, publishedCount: 0, draftCount: 0, archivedCount: 0, totalSubmissions: 0, totalGraded: 0 },
+          }
+        }
+      }
+    }
+    if (params.scope.type === "class_taught") {
+      // 教师仅能看到所教班级对应年级的考试
+      if (params.scope.classIds.length === 0) {
+        conditions.push(eq(exams.id, "__none__"))
+      } else {
+        const classGradeMap = await getClassGradeIdsByClassIds(params.scope.classIds)
+        const gradeIds = Array.from(new Set(classGradeMap.values()))
+        if (!gradeIds.includes(params.gradeId)) {
+          return {
+            gradeId: params.gradeId,
+            exams: [],
+            totals: { examCount: 0, publishedCount: 0, draftCount: 0, archivedCount: 0, totalSubmissions: 0, totalGraded: 0 },
+          }
+        }
+      }
+    }
+
+    const examRows = await db
+      .select({
+        id: exams.id,
+        title: exams.title,
+        status: exams.status,
+        subjectId: exams.subjectId,
+        startTime: exams.startTime,
+        createdAt: exams.createdAt,
+      })
+      .from(exams)
+      .where(and(...conditions))
+      .orderBy(desc(exams.createdAt))
+
+    if (examRows.length === 0) {
+      return {
+        gradeId: params.gradeId,
+        exams: [],
+        totals: { examCount: 0, publishedCount: 0, draftCount: 0, archivedCount: 0, totalSubmissions: 0, totalGraded: 0 },
+      }
+    }
+
+    const examIds = examRows.map((e) => e.id)
+
+    // 并行查询：科目名称 + 提交统计
+    const [subjectOptions, submissionRows] = await Promise.all([
+      getSubjectOptions(),
+      db
+        .select({
+          examId: examSubmissions.examId,
+          status: examSubmissions.status,
+          score: examSubmissions.score,
+        })
+        .from(examSubmissions)
+        .where(inArray(examSubmissions.examId, examIds)),
+    ])
+
+    const subjectNameById = new Map<string, string>()
+    for (const s of subjectOptions) subjectNameById.set(s.id, s.name)
+
+    // 按考试分组统计提交
+    const statsByExam = new Map<string, { total: number; graded: number; scoreSum: number }>()
+    for (const s of submissionRows) {
+      const entry = statsByExam.get(s.examId) ?? { total: 0, graded: 0, scoreSum: 0 }
+      entry.total += 1
+      if (s.status === "graded" && s.score !== null) {
+        entry.graded += 1
+        entry.scoreSum += Number(s.score)
+      }
+      statsByExam.set(s.examId, entry)
+    }
+
+    const items: GradeExamItem[] = examRows.map((e) => {
+      const stats = statsByExam.get(e.id) ?? { total: 0, graded: 0, scoreSum: 0 }
+      return {
+        id: e.id,
+        title: e.title,
+        status: toExamStatus(e.status),
+        subjectId: e.subjectId,
+        subjectName: e.subjectId ? (subjectNameById.get(e.subjectId) ?? null) : null,
+        scheduledAt: e.startTime ? e.startTime.toISOString() : null,
+        createdAt: e.createdAt.toISOString(),
+        submissionCount: stats.total,
+        gradedCount: stats.graded,
+        averageScore: stats.graded > 0 ? Math.round((stats.scoreSum / stats.graded) * 100) / 100 : null,
+      }
+    })
+
+    const totals = {
+      examCount: items.length,
+      publishedCount: items.filter((i) => i.status === "published").length,
+      draftCount: items.filter((i) => i.status === "draft").length,
+      archivedCount: items.filter((i) => i.status === "archived").length,
+      totalSubmissions: items.reduce((sum, i) => sum + i.submissionCount, 0),
+      totalGraded: items.reduce((sum, i) => sum + i.gradedCount, 0),
+    }
+
+    return { gradeId: params.gradeId, exams: items, totals }
+  }
+)
+
+/**
+ * 获取可用于成绩录入的试卷列表（按 scope 过滤，只返回有题目的试卷）。
+ */
+export const getExamsForGradeEntry = cache(
+  async (scope: DataScope): Promise<ExamOptionForEntry[]> => {
+    const conditions: SQL[] = []
+
+    if (scope.type === "owned") {
+      conditions.push(eq(exams.creatorId, scope.userId))
+    }
+    if (scope.type === "class_taught" && scope.classIds.length > 0) {
+      const classGradeMap = await getClassGradeIdsByClassIds(scope.classIds)
+      const gradeIds = Array.from(new Set(classGradeMap.values()))
+      if (gradeIds.length > 0) {
+        conditions.push(inArray(exams.gradeId, gradeIds))
+      } else {
+        conditions.push(eq(exams.id, "__none__"))
+      }
+    } else if (scope.type === "class_taught") {
+      conditions.push(eq(exams.id, "__none__"))
+    }
+    if (scope.type === "grade_managed" && scope.gradeIds.length > 0) {
+      conditions.push(inArray(exams.gradeId, scope.gradeIds))
+    } else if (scope.type === "grade_managed") {
+      conditions.push(eq(exams.id, "__none__"))
+    }
+
+    const examRows = await db.query.exams.findMany({
+      where: conditions.length ? and(...conditions) : undefined,
+      orderBy: [desc(exams.createdAt)],
+      with: { subject: true, gradeEntity: true },
+    })
+
+    if (examRows.length === 0) return []
+
+    const examIds = examRows.map((e) => e.id)
+    const questionCountRows = await db
+      .select({ examId: examQuestions.examId, count: count() })
+      .from(examQuestions)
+      .where(inArray(examQuestions.examId, examIds))
+      .groupBy(examQuestions.examId)
+
+    const questionCountMap = new Map(
+      questionCountRows.map((r) => [r.examId, Number(r.count)])
+    )
+
+    return examRows
+      .filter((e) => (questionCountMap.get(e.id) ?? 0) > 0)
+      .map((e) => {
+        const meta = parseExamMeta(e.description ?? null)
+        return {
+          id: e.id,
+          title: e.title,
+          subjectName: e.subject?.name ?? getString(meta, "subject") ?? "General",
+          gradeName: e.gradeEntity?.name ?? getString(meta, "grade") ?? "General",
+          questionCount: questionCountMap.get(e.id) ?? 0,
+          totalScore: getNumber(meta, "totalScore") ?? 100,
+        }
+      })
+  }
+)
+
+/**
+ * 获取单个试卷详情（含题目列表），用于成绩录入表格表头。
+ */
+export const getExamForGradeEntry = cache(
+  async (examId: string, scope?: DataScope): Promise<ExamForGradeEntry | null> => {
+    const exam = await db.query.exams.findFirst({
+      where: eq(exams.id, examId),
+      with: { subject: true, gradeEntity: true },
+    })
+
+    if (!exam) return null
+
+    if (scope && scope.type !== "all") {
+      if (scope.type === "owned" && exam.creatorId !== scope.userId) return null
+      if (scope.type === "grade_managed") {
+        if (scope.gradeIds.length === 0) return null
+        if (!scope.gradeIds.includes(exam.gradeId ?? "")) return null
+      }
+      if (scope.type === "class_taught") {
+        if (scope.classIds.length === 0) return null
+        const classGradeMap = await getClassGradeIdsByClassIds(scope.classIds)
+        const gradeIds = Array.from(new Set(classGradeMap.values()))
+        if (gradeIds.length === 0) return null
+        if (!gradeIds.includes(exam.gradeId ?? "")) return null
+      }
+    }
+
+    const questionRows = await db
+      .select({
+        questionId: examQuestions.questionId,
+        score: examQuestions.score,
+        order: examQuestions.order,
+        type: questions.type,
+      })
+      .from(examQuestions)
+      .innerJoin(questions, eq(examQuestions.questionId, questions.id))
+      .where(eq(examQuestions.examId, examId))
+      .orderBy(asc(examQuestions.order))
+
+    if (questionRows.length === 0) return null
+
+    const meta = parseExamMeta(exam.description ?? null)
+    const computedTotal = questionRows.reduce((sum, q) => sum + (q.score ?? 0), 0)
+
+    return {
+      id: exam.id,
+      title: exam.title,
+      subjectId: exam.subjectId,
+      gradeId: exam.gradeId,
+      totalScore: getNumber(meta, "totalScore") ?? computedTotal,
+      questions: questionRows.map((q) => ({
+        id: q.questionId,
+        order: q.order ?? 0,
+        score: q.score ?? 0,
+        type: q.type,
+      })),
+    }
+  }
+)
diff --git a/src/modules/exams/types.ts b/src/modules/exams/types.ts
index 8a0a556..6055dc0 100644
--- a/src/modules/exams/types.ts
+++ b/src/modules/exams/types.ts
@@ -30,3 +30,65 @@ export interface ExamSubmission {
   status: SubmissionStatus
 }
 
+/**
+ * 年级仪表盘 - 维度3：年级下考试列表项（含提交统计）。
+ */
+export interface GradeExamItem {
+  id: string
+  title: string
+  status: ExamStatus
+  subjectId: string | null
+  subjectName: string | null
+  scheduledAt: string | null
+  createdAt: string
+  /** 提交记录总数（started + submitted + graded） */
+  submissionCount: number
+  /** 已评分提交数 */
+  gradedCount: number
+  /** 已评分提交的平均分 */
+  averageScore: number | null
+}
+
+export interface GradeExamsResult {
+  gradeId: string
+  exams: GradeExamItem[]
+  totals: {
+    examCount: number
+    publishedCount: number
+    draftCount: number
+    archivedCount: number
+    totalSubmissions: number
+    totalGraded: number
+  }
+}
+
+// --- 成绩录入用的试卷类型 ---
+
+/** 试卷题目项（用于录入表格表头） */
+export interface ExamQuestionItem {
+  id: string
+  order: number
+  score: number
+  type: string
+}
+
+/** 试卷信息（用于录入，含题目列表） */
+export interface ExamForGradeEntry {
+  id: string
+  title: string
+  subjectId: string | null
+  gradeId: string | null
+  totalScore: number
+  questions: ExamQuestionItem[]
+}
+
+/** 试卷列表项（用于选择器） */
+export interface ExamOptionForEntry {
+  id: string
+  title: string
+  subjectName: string
+  gradeName: string
+  questionCount: number
+  totalScore: number
+}
+
diff --git a/src/modules/homework/actions.ts b/src/modules/homework/actions.ts
index 57f1f02..50598ed 100644
--- a/src/modules/homework/actions.ts
+++ b/src/modules/homework/actions.ts
@@ -8,6 +8,8 @@ import { Permissions } from "@/shared/types/permissions"
 import type { ActionState } from "@/shared/types/action-state"
 import { handleActionError, safeJsonParse, safeParseDate } from "@/shared/lib/action-utils"
 import { trackExamEvent } from "@/shared/lib/track-event"
+import { collectFromHomeworkSubmission } from "@/modules/error-book/data-access-collection"
+import { updateMasteryFromHomeworkSubmission } from "@/modules/diagnostic/data-access"
 
 import { CreateHomeworkAssignmentSchema, GradeHomeworkSchema } from "./schema"
 import {
@@ -32,6 +34,26 @@ const parseStudentIds = (raw: string): string[] => {
     .filter((s) => s.length > 0)
 }
 
+/**
+ * 批改后处理：自动采集错题 + 更新知识点掌握度。
+ *
+ * 使用 Promise.allSettled 并行执行，确保一个失败不影响另一个。
+ * 错误被记录但不抛出，不影响批改操作的成功返回。
+ */
+async function runPostGradingHooks(submissionId: string, studentId: string): Promise<void> {
+  const [errorBookResult, masteryResult] = await Promise.allSettled([
+    collectFromHomeworkSubmission(submissionId, studentId),
+    updateMasteryFromHomeworkSubmission(submissionId),
+  ])
+
+  if (errorBookResult.status === "rejected") {
+    console.error(`[post-grading] 错题采集失败 submission=${submissionId}:`, errorBookResult.reason)
+  }
+  if (masteryResult.status === "rejected") {
+    console.error(`[post-grading] 掌握度更新失败 submission=${submissionId}:`, masteryResult.reason)
+  }
+}
+
 export async function createHomeworkAssignmentAction(
   prevState: ActionState<string> | null,
   formData: FormData
@@ -245,6 +267,11 @@ export async function submitHomeworkAction(
     // V3-2: 即时自动批改回写
     const { isFullyAutoGraded, totalScore } = await markHomeworkSubmitted(submissionId, isLate)
 
+    // 批改完成后自动采集错题 + 更新掌握度（仅当全部自动批改完成时）
+    if (isFullyAutoGraded) {
+      await runPostGradingHooks(submissionId, ctx.userId)
+    }
+
     revalidatePath("/teacher/homework/submissions")
     revalidatePath("/student/learning/assignments")
 
@@ -293,16 +320,14 @@ export async function gradeHomeworkSubmissionAction(
 
     const { submissionId, answers } = parsed.data
 
-    // 权限二次校验：非管理员仅可批改自己创建的作业提交
-    // 管理员（dataScope.type === "all"）可批改所有提交
-    if (ctx.dataScope.type !== "all") {
-      const submissionForGrading = await getHomeworkSubmissionForGrading(submissionId)
-      if (!submissionForGrading) {
-        return { success: false, message: "Submission not found" }
-      }
-      if (submissionForGrading.creatorId !== ctx.userId) {
-        return { success: false, message: "You can only grade submissions for your own assignments" }
-      }
+    // 权限二次校验 + 获取 studentId（用于批改后处理）
+    // 非管理员仅可批改自己创建的作业提交；管理员（dataScope.type === "all"）可批改所有提交
+    const submissionForGrading = await getHomeworkSubmissionForGrading(submissionId)
+    if (!submissionForGrading) {
+      return { success: false, message: "Submission not found" }
+    }
+    if (ctx.dataScope.type !== "all" && submissionForGrading.creatorId !== ctx.userId) {
+      return { success: false, message: "You can only grade submissions for your own assignments" }
     }
 
     await gradeHomeworkAnswers(
@@ -314,6 +339,9 @@ export async function gradeHomeworkSubmissionAction(
       }))
     )
 
+    // 批改完成后自动采集错题 + 更新掌握度
+    await runPostGradingHooks(submissionId, submissionForGrading.studentId)
+
     revalidatePath("/teacher/homework/submissions")
 
     // V3-4: 埋点监控
@@ -373,6 +401,16 @@ export async function batchAutoGradeSubmissionsAction(
     const failedCount = results.filter((r) => !r.success).length
     const fullyGradedCount = results.filter((r) => r.success && r.isFullyAutoGraded).length
 
+    // 批改完成后自动采集错题 + 更新掌握度（仅对成功批改的提交）
+    await Promise.allSettled(
+      results
+        .filter(
+          (r): r is typeof r & { studentId: string } =>
+            r.success && typeof r.studentId === "string" && r.studentId.length > 0,
+        )
+        .map((r) => runPostGradingHooks(r.submissionId, r.studentId)),
+    )
+
     revalidatePath("/teacher/homework/submissions")
     revalidatePath("/teacher/homework/assignments")
 
diff --git a/src/modules/homework/data-access-error-collection.ts b/src/modules/homework/data-access-error-collection.ts
new file mode 100644
index 0000000..b3f6f66
--- /dev/null
+++ b/src/modules/homework/data-access-error-collection.ts
@@ -0,0 +1,136 @@
+import "server-only"
+
+import { eq } from "drizzle-orm"
+
+import { db } from "@/shared/db"
+import {
+  homeworkAnswers,
+  homeworkAssignmentQuestions,
+  homeworkAssignments,
+  homeworkSubmissions,
+} from "@/shared/db/schema"
+import { getExamSubjectIdMap } from "@/modules/exams/data-access"
+
+/**
+ * 错题采集所需的答案数据（单题）
+ */
+export type AnswerForErrorCollection = {
+  questionId: string
+  answerContent: unknown
+  score: number | null
+  feedback: string | null
+  maxScore: number
+}
+
+/**
+ * 作业提交的错题采集数据
+ */
+export type HomeworkSubmissionDataForErrorCollection = {
+  assignmentId: string
+  subjectId: string | null
+  answers: AnswerForErrorCollection[]
+}
+
+/**
+ * 跨模块接口：获取作业提交的错题采集数据。
+ *
+ * 供 error-book 模块调用，避免 error-book 直接查询 homeworkSubmissions、
+ * homeworkAssignments、homeworkAnswers、homeworkAssignmentQuestions 等属于
+ * homework 模块的表，以及 exams 表（通过 exams 模块的 getExamSubjectIdMap 获取）。
+ *
+ * 返回该提交的所有答案（含得分、反馈、满分），由 error-book 模块
+ * 自行筛选错题（score < maxScore）并采集。
+ *
+ * @param submissionId 作业提交 ID
+ * @returns 提交数据；若提交不存在则返回 null
+ */
+export async function getHomeworkSubmissionDataForErrorCollection(
+  submissionId: string,
+): Promise<HomeworkSubmissionDataForErrorCollection | null> {
+  const submission = await db.query.homeworkSubmissions.findFirst({
+    where: eq(homeworkSubmissions.id, submissionId),
+    columns: { id: true, assignmentId: true },
+  })
+
+  if (!submission) return null
+
+  // 并行获取作业信息、提交答案、题目满分
+  const [assignment, answers, hwQuestionScores] = await Promise.all([
+    db.query.homeworkAssignments.findFirst({
+      where: eq(homeworkAssignments.id, submission.assignmentId),
+      columns: { id: true, sourceExamId: true },
+    }),
+    db
+      .select({
+        questionId: homeworkAnswers.questionId,
+        answerContent: homeworkAnswers.answerContent,
+        score: homeworkAnswers.score,
+        feedback: homeworkAnswers.feedback,
+      })
+      .from(homeworkAnswers)
+      .where(eq(homeworkAnswers.submissionId, submissionId)),
+    db
+      .select({
+        questionId: homeworkAssignmentQuestions.questionId,
+        maxScore: homeworkAssignmentQuestions.score,
+      })
+      .from(homeworkAssignmentQuestions)
+      .where(eq(homeworkAssignmentQuestions.assignmentId, submission.assignmentId)),
+  ])
+
+  // 获取学科 ID：若作业派生自试卷，从源试卷获取 subjectId
+  let subjectId: string | null = null
+  if (assignment?.sourceExamId) {
+    const subjectIdMap = await getExamSubjectIdMap([assignment.sourceExamId])
+    subjectId = subjectIdMap.get(assignment.sourceExamId) ?? null
+  }
+
+  const maxScoreMap = new Map(hwQuestionScores.map((q) => [q.questionId, q.maxScore ?? 0]))
+
+  const mappedAnswers: AnswerForErrorCollection[] = answers.map((a) => ({
+    questionId: a.questionId,
+    answerContent: a.answerContent,
+    score: a.score,
+    feedback: a.feedback,
+    maxScore: maxScoreMap.get(a.questionId) ?? 0,
+  }))
+
+  return {
+    assignmentId: submission.assignmentId,
+    subjectId,
+    answers: mappedAnswers,
+  }
+}
+
+/**
+ * 跨模块接口：获取作业提交的答案数据（供 diagnostic 模块更新掌握度使用）。
+ *
+ * 返回格式与 exams 模块的 `getExamSubmissionWithAnswers` 一致，
+ * 便于 diagnostic 模块统一处理考试提交和作业提交的掌握度更新。
+ *
+ * @param submissionId 作业提交 ID
+ * @returns `{ studentId, answers: Array<{ questionId, score }> }`；若提交不存在则返回 null
+ */
+export async function getHomeworkSubmissionWithAnswersForMastery(
+  submissionId: string,
+): Promise<{ studentId: string; answers: Array<{ questionId: string; score: number | null }> } | null> {
+  const submission = await db.query.homeworkSubmissions.findFirst({
+    where: eq(homeworkSubmissions.id, submissionId),
+    columns: { studentId: true },
+  })
+
+  if (!submission) return null
+
+  const answers = await db
+    .select({
+      questionId: homeworkAnswers.questionId,
+      score: homeworkAnswers.score,
+    })
+    .from(homeworkAnswers)
+    .where(eq(homeworkAnswers.submissionId, submissionId))
+
+  return {
+    studentId: submission.studentId,
+    answers,
+  }
+}
diff --git a/src/modules/homework/data-access-write.ts b/src/modules/homework/data-access-write.ts
index 48ae8a5..86e3f0d 100644
--- a/src/modules/homework/data-access-write.ts
+++ b/src/modules/homework/data-access-write.ts
@@ -132,6 +132,7 @@ export const getHomeworkSubmissionForGrading = async (
   assignmentId: string
   creatorId: string
   sourceExamId: string | null
+  studentId: string
 } | null> => {
   const submission = await db.query.homeworkSubmissions.findFirst({
     where: eq(homeworkSubmissions.id, submissionId),
@@ -143,6 +144,7 @@ export const getHomeworkSubmissionForGrading = async (
     assignmentId: submission.assignmentId,
     creatorId: submission.assignment.creatorId,
     sourceExamId: submission.assignment.sourceExamId,
+    studentId: submission.studentId,
   }
 }
 
@@ -395,6 +397,7 @@ export const batchAutoGradeSubmissions = async (
   success: boolean
   isFullyAutoGraded: boolean
   totalScore: number
+  studentId?: string
   message?: string
 }>> => {
   const now = new Date()
@@ -403,6 +406,7 @@ export const batchAutoGradeSubmissions = async (
     success: boolean
     isFullyAutoGraded: boolean
     totalScore: number
+    studentId?: string
     message?: string
   }> = []
 
@@ -410,7 +414,7 @@ export const batchAutoGradeSubmissions = async (
     try {
       const submission = await db.query.homeworkSubmissions.findFirst({
         where: eq(homeworkSubmissions.id, submissionId),
-        columns: { id: true, assignmentId: true },
+        columns: { id: true, assignmentId: true, studentId: true },
       })
 
       if (!submission) {
@@ -483,6 +487,7 @@ export const batchAutoGradeSubmissions = async (
         success: true,
         isFullyAutoGraded,
         totalScore,
+        studentId: submission.studentId,
       })
     } catch (error) {
       results.push({