class Test extends Model
{
    protected $fillable = [
        'subject','date',
   ];


    public function getSubjectAttribute($value)
    {
        return ucfirst($value);
    }
}

public function get_specific_subject($id){
    $subject = DB::table("subjects")
        ->where("id", "=", $id)
        ->first();

    return $subject;
}

$subject = new Test();
    $subject = $subject->get_specific_subject($subject_id);
    dd($subject);