diff --git a/backend/api/services/exoValidation.py b/backend/api/services/exoValidation.py
index 208b67d..80825e7 100644
--- a/backend/api/services/exoValidation.py
+++ b/backend/api/services/exoValidation.py
@@ -1,19 +1,20 @@
 
 import ast
-from multiprocessing import Manager
+import os
 import random
 import re
 import string
-from fastapi.exceptions import HTTPException
-from fastapi import UploadFile, status
+from multiprocessing import Manager
+
 import sympy
-from tortoise.validators import Validator
+from fastapi import UploadFile, status
+from fastapi.exceptions import HTTPException
 from tortoise.exceptions import ValidationError
-import types
-from services.timeout import Process
+
 from services.io import is_binary_file
-import os 
-VALIDATED_MODULES = ["random", "string", "sympy"]
+from services.timeout import Process
+
+VALIDATED_MODULES = ["random", "string", "sympy", "math"]
 def checkExoSupportCompatibility(obj):
     isPdf = False if (obj['pdf'] == None or (
         obj['calcul'] == False and obj['pdf'] == False)) else True