diff --git a/backend/app/api/v1/exam.py b/backend/app/api/v1/exam.py
index 8bea421..18b3f9c 100644
--- a/backend/app/api/v1/exam.py
+++ b/backend/app/api/v1/exam.py
@@ -16,6 +16,7 @@ from app.models.exam_mistake import ExamMistake
 from app.models.position_member import PositionMember
 from app.models.position_course import PositionCourse
 from app.schemas.base import ResponseModel
+from app.services.exam_service import ExamService
 from app.schemas.exam import (
     StartExamRequest,
     StartExamResponse,