math_cms/app/Models/ExamPaper.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class ExamPaper extends Model
{
    protected $table = 'exam_papers';
    protected $primaryKey = 'id';
    public $incrementing = false;
    protected $keyType = 'string';
    public $timestamps = true;
    protected $fillable = ['id', 'title', 'total_score', 'duration', 'created_at', 'updated_at'];
}