Enhance user marking query to ensure distinct exams and order by name for better organization

rad/views.py

@@ -289,12 +289,16 @@ def user_marking_partial(request, exam_type: str):
         return HttpResponse("Unknown exam type", status=400)
 
     # Exams where user is an author or an authorised marker
-    exams_qs = ExamModel.objects.filter(
-        archive=False, exam_mode=True
-    ).filter(Q(author=user) | Q(markers=user)).prefetch_related("author", "markers")
+    exams_qs = (
+        ExamModel.objects.filter(archive=False, exam_mode=True)
+        .filter(Q(author=user) | Q(markers=user))
+        .distinct()
+        .order_by("name")
+        .prefetch_related("author", "markers")
+    )
 
     exams_data = []
-    for exam in exams_qs.order_by("name"):
+    for exam in exams_qs:
         has_unmarked = False
         unmarked_count = 0
         # iterate questions and use their helper to count unmarked answers when available