diff --git a/apps/quiz/models/quiz.py b/apps/quiz/models/quiz.py
index 37a9564..e7ce23c 100644
--- a/apps/quiz/models/quiz.py
+++ b/apps/quiz/models/quiz.py
@@ -54,7 +54,7 @@ class Question(models.Model):
     class Meta:
         verbose_name = _("Question")
         verbose_name_plural = _("Questions")
-        ordering = ("-priority", "-id",)
+        ordering = ("priority", "id",)
 
     def __str__(self):
         return self.question
@@ -62,6 +62,12 @@ class Question(models.Model):
     def __repr__(self):
         return f"Question(id={self.id})"
 
+    def save(self, *args, **kwargs):
+        if self.priority is None:
+            max_priority = Question.objects.filter(quiz=self.quiz).aggregate(models.Max('priority'))['priority__max']
+            self.priority = (max_priority or 0) + 1
+        super().save(*args, **kwargs)
+
 
 class QuizRankUser(User):
     class Meta:
diff --git a/apps/quiz/serializers/admin.py b/apps/quiz/serializers/admin.py
index 7bf1cb0..d72570d 100644
--- a/apps/quiz/serializers/admin.py
+++ b/apps/quiz/serializers/admin.py
@@ -1,5 +1,5 @@
 from rest_framework import serializers
-from apps.quiz.models import Quiz, Question, QuizParticipant
+from apps.quiz.models import Quiz, Question, QuizParticipant, ParticipantAnswer
 from apps.course.models import Course, CourseLesson
 from apps.account.models import User
 
@@ -93,9 +93,16 @@ class AdminQuestionSerializer(serializers.ModelSerializer):
         ]
 
 
+class AdminParticipantAnswerSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = ParticipantAnswer
+        fields = ['id', 'question', 'option_num', 'at_time', 'answer_timing']
+
+
 class AdminQuizParticipantSerializer(serializers.ModelSerializer):
     user_name = serializers.CharField(source='user.fullname', read_only=True)
     user_email = serializers.EmailField(source='user.email', read_only=True)
+    answers = AdminParticipantAnswerSerializer(many=True, read_only=True)
 
     class Meta:
         model = QuizParticipant
@@ -109,7 +116,8 @@ class AdminQuizParticipantSerializer(serializers.ModelSerializer):
             'total_timing', 
             'question_score', 
             'timing_score', 
-            'total_score'
+            'total_score',
+            'answers'
         ]
 
 
diff --git a/apps/quiz/views/admin.py b/apps/quiz/views/admin.py
index 2a99f52..0a7babb 100644
--- a/apps/quiz/views/admin.py
+++ b/apps/quiz/views/admin.py
@@ -76,7 +76,7 @@ class AdminQuizViewSet(ModelViewSet):
         quiz = self.get_object()
 
         # 1. Fetch participants
-        participants_qs = QuizParticipant.objects.filter(quiz=quiz).select_related('user')
+        participants_qs = QuizParticipant.objects.filter(quiz=quiz).select_related('user').prefetch_related('answers')
         participants_serializer = AdminQuizParticipantSerializer(participants_qs, many=True)
 
         # 2. Fetch absentees
@@ -128,6 +128,34 @@ class AdminQuestionViewSet(ModelViewSet):
 
         return queryset.order_by('priority', 'id')
 
+    @action(detail=False, methods=['post'])
+    def reorder(self, request):
+        """
+        Reorders questions in bulk.
+        Accepts a list of question IDs.
+        Format:
+        {
+            "question_ids": [10, 12, 11, 15]
+        }
+        """
+        question_ids = request.data.get('question_ids', [])
+        if not question_ids:
+            return Response({'error': 'question_ids list is required'}, status=400)
+
+        # Update priority for each question based on its position in the list
+        from django.db import transaction
+        questions = Question.objects.filter(id__in=question_ids)
+        question_map = {q.id: q for q in questions}
+
+        with transaction.atomic():
+            for idx, q_id in enumerate(question_ids):
+                if q_id in question_map:
+                    question = question_map[q_id]
+                    question.priority = idx + 1
+                    question.save(update_fields=['priority'])
+
+        return Response({'status': 'success'})
+
 
 class AdminCourseListView(ListAPIView):
     """