fix question ordering through mark systems

rapids/views.py

@@ -402,11 +402,6 @@ class RapidUpdate(RevisionMixin, AuthorOrCheckerRequiredMixin, UpdateView):
         return context
 
     def form_valid(self, form):
-        # save exam orders (there must be a better way to do this)
-        # exam_orders = {}
-        # for exam in self.object.exams.all():
-        #    exam_orders[exam] = list(exam.exam_questions.all())
-
         self.object = form.save(commit=False)
         self.object.save()
 
@@ -591,7 +586,7 @@ def mark(request, exam_pk, sk, unmarked_exam_answers_only=True, review=False):
     elif not unmarked_exam_answers_only:
         mark_url = "rapids:mark_all"
 
-    questions = exam.exam_questions.all()
+    questions = exam.get_questions()
 
     n = sk