change

Entities/DTO/ExamDto.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Entities.DTO
+{
+	public class ExamDto
+	{
+		public Guid? AssignmentId { get; set; }
+		public string AssignmentTitle { get; set; } = string.Empty;
+		public string Description { get; set; }
+		public string SubjectArea { get; set; }
+		public List<QuestionGroupDto> QuestionGroups { get; set; } = new List<QuestionGroupDto>();
+	}
+
+	public class QuestionGroupDto
+	{
+		public int Index { get; set; } 
+
+		public string Title { get; set; }
+
+		public int Score { get; set; }
+
+		public string QuestionReference { get; set; } 
+
+		public List<SubQuestionDto> SubQuestions { get; set; } = new List<SubQuestionDto>();
+
+		public List<QuestionGroupDto> SubQuestionGroups { get; set; } = new List<QuestionGroupDto>();
+	}
+
+	public class SubQuestionDto
+	{
+
+		public byte Index { get; set; } 
+
+		public string Stem { get; set; }
+
+		public float Score { get; set; }
+
+		public List<OptionDto> Options { get; set; } = new List<OptionDto>();
+
+		public string SampleAnswer { get; set; } 
+
+		public string QuestionType { get; set; } 
+		public string DifficultyLevel { get; set; } 
+
+	}
+
+	public class OptionDto
+	{
+		public string Value { get; set; }
+	}
+}