Learn, Share, Build

$i = 0;
foreach($request->id as $id) {
    $model = new Model;
    $model->user_id = $id;
    $model->ca_mark = $request->ca_mark[$i];
    $model->exam_mark = $request->ca_mark[$i];
    $model->remarks = $request->remarks[$i];
    $model->save();
    $i++;
}

Query Builder

$i = 0;
foreach($request->id as $id) {
    DB::table('table')->insert([
        'user_id' => $id, 
        'ca_mark' => $request->ca_mark[$i],
        'exam_mark' => $request->ca_mark[$i],
        'remarks' => $request->remarks[$i]
    ]);
    $i++;
}

The above code has been written based on an assumption of the database table structure. In short, foreach on the ID's as this would be the student ID, and take the ca_mark, exam_mark and remark based on the key of the id.