Fixed

app/Services/StudentService.php

@@ -2,6 +2,7 @@
 
 namespace App\Services;
 
+use App\Enums\ScoreEnum;
 use App\Models\Student;
 use App\Models\User;
 use Illuminate\Pagination\LengthAwarePaginator;
@@ -27,6 +28,9 @@ class StudentService implements ServiceInterface
             'grade_id' => $data['grade_id'],
         ]);
         $student->user()->save($user);
+        $student
+            ->lessons()
+            ->syncWithPivotValues($student->grade->lessons->pluck('id')->all(), ['score' => ScoreEnum::WithoutScore]);
 
         return $student;
     }