feat: add exam score management

apps/server/src/entities/index.ts

@@ -32,6 +32,7 @@ export { Notification, NotificationType } from './notification.entity';
 export { StudentProfile } from './student-profile.entity';
 export { StudentEnrollment } from './student-enrollment.entity';
 export { ExamScore } from './exam-score.entity';
+export { Exam } from './exam.entity';
 export { LearningRecord } from './learning-record.entity';
 export { ResultArchive } from './result-archive.entity';
 export { ArchiveAttachment } from './archive-attachment.entity';