diff --git a/sbas/views.py b/sbas/views.py
index a73278fa..ddc02e22 100644
--- a/sbas/views.py
+++ b/sbas/views.py
@@ -267,9 +267,9 @@ def exam_take(request, pk, sk, cid):
             # answer.published_date = timezone.now()
             answer.save()
         if "next" in request.POST:
-            return redirect("sbas:exam_take", pk=pk, sk=n + 1, cid=cid)
+            return redirect("sbas:exam_take", pk=pk, sk=pos + 1, cid=cid)
         elif "previous" in request.POST:
-            return redirect("sbas:exam_take", pk=pk, sk=n - 1, cid=cid)
+            return redirect("sbas:exam_take", pk=pk, sk=pos - 1, cid=cid)
     else:
         form = CidUserAnswerForm(instance=answer)