در `app/Providers/AuthServiceProvider.php` (یا مسیر مشابه در Laravel 12) این Policies را ثبت کنید:
protected $policies = [
    \App\Models\QuestionBank::class => \App\Policies\QuestionBankPolicy::class,
    \App\Models\Question::class => \App\Policies\QuestionPolicy::class,
    \App\Models\Exam::class => \App\Policies\ExamPolicy::class,
    \App\Models\Attempt::class => \App\Policies\AttemptPolicy::class,
];