clean up

physics/models.py

@@ -10,8 +10,6 @@ from django.urls import reverse
 
 from django.utils.translation import gettext_lazy as _
 
-from sortedm2m.fields import SortedManyToManyField
-
 from generic.models import CidUser, CidUserGroup, ExamBase, ExamCollection, ExamUserStatus, QuestionBase, QuestionNote, UserAnswerBase, UserUserGroup
 
 import reversion
@@ -149,7 +147,6 @@ class ExamQuestionDetail(models.Model):
 class Exam(ExamBase):
     app_name = "physics"
 
-    #exam_questions = SortedManyToManyField(Question, related_name="exams", blank="true")
     exam_questions = models.ManyToManyField(Question, through=ExamQuestionDetail, related_name="exams")
 
     time_limit = models.IntegerField(