diff --git a/src/pages/U4/u4.tsx b/src/pages/U4/u4.tsx
index 32768ab..f5ce169 100644
--- a/src/pages/U4/u4.tsx
+++ b/src/pages/U4/u4.tsx
@@ -53,9 +53,9 @@ const U4: React.FC = () => {
       <DecorLine />
 
       <div className="u4-card-grid">
-        {test.map((t) => (
+        {test.map((t, index) => (
           <div
-            key={t.id}
+            key={`${t.id}-${t.exam_id}-${index}`}
             className="u4-card"
             onClick={() => { setSelectedId(t.id); }}
           >