switch exam questions to a sorted m2m

anatomy/models.py

@@ -9,6 +9,8 @@ from django.urls import reverse
 
 from django.utils.translation import ugettext_lazy as _
 
+from sortedm2m.fields import SortedManyToManyField
+
 image_storage = FileSystemStorage(
     # Physical file location ROOT
     location=u"{0}/anatomy/".format(settings.MEDIA_ROOT),
@@ -201,7 +203,7 @@ class Answer(models.Model):
 
 class Exam(models.Model):
     name = models.CharField(max_length=200)
-    exam_questions = models.ManyToManyField(AnatomyQuestion,
+    exam_questions = SortedManyToManyField(AnatomyQuestion,
                                             related_name="exams", blank="true")
 
     active = models.BooleanField(help_text="If an exam should be available",