diff --git a/apps/edu/views.py b/apps/edu/views.py
index f16c59b8..1f4b980a 100644
--- a/apps/edu/views.py
+++ b/apps/edu/views.py
@@ -16,6 +16,7 @@ from drf_yasg.utils import swagger_auto_schema
 from apps.utils.permission import has_perm
 from .filters import ExamFilter, ExamRecordFilter
 from apps.system.models import User
+from datetime import datetime
 
 # Create your views here.
 class QuestioncatViewSet(CustomModelViewSet):
@@ -26,6 +27,7 @@ class QuestioncatViewSet(CustomModelViewSet):
 class QuestionViewSet(CustomModelViewSet):
     queryset = Question.objects.all()
     serializer_class = QuestionSerializer
+    select_related_fields = ["questioncat"]
     filterset_fields = ["questioncat", "type", "enabled"]
 
     def update(self, request, *args, **kwargs):
@@ -54,6 +56,17 @@ class ExamViewSet(CustomModelViewSet):
     filterset_class = ExamFilter
     retrieve_serializer_class = ExamDetailSerializer
 
+    def add_info_for_list(self, data):
+        """
+        添加是否可参加字段
+        """
+        now = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
+        for item in data:
+            item["can_attend"] = False
+            if item["open_time"] <= now <= item["close_time"]:
+                item["can_attend"] = True
+        return data
+
     def get_queryset(self):
         qs = super().get_queryset()
         if has_perm(self.request.user, 'exam.view'):