fix school year for all tables

app/Models/ExamDraftModel.php

@@ -3,9 +3,12 @@
 namespace App\Models;
 
 use CodeIgniter\Model;
+use App\Models\Concerns\SchoolYearAutoFillTrait;
 
 class ExamDraftModel extends Model
 {
+    use SchoolYearAutoFillTrait;
+
     protected $table = 'exam_drafts';
     protected $primaryKey = 'id';
     protected $returnType = 'array';
@@ -65,6 +68,7 @@ class ExamDraftModel extends Model
         'author_id' => 'if_exist|is_natural_no_zero',
         'class_section_id' => 'if_exist|is_natural_no_zero',
         'version' => 'if_exist|is_natural_no_zero',
+        'school_year' => 'required|string|max_length[9]',
     ];
 
     protected $validationMessages = [