Insert multiple data with many to many relationship in laravel

I have four models with many to many relationship
Users
-id
-Email
-Password
Student
-id -Name
-school
---------
Subject
-id
-subname
Topic
-id
-topName
-sub_id
--------
When they broke down produce their respective pivot tables
i.e
-student_user
-id
-student_id
-user_id
-student_subject
-id
-studdent_id
-subject_id
-subject_name
-student_topic
-id
-student_id
-topic-id
-topic_name
-.........
I want to insert them with multiple selecting of the inputs i.e subject and topics must more than one. What i failed is how to insert them into a data at the same time with such kind of relation since i used for each loop and i failed to figure out what attribute i can use to?? Help

public function store(Request $request)
    {
        /*$this->validate($request,[
              'FullName' => 'requred|string',
             
        ]);*/

        $student = new Student();
        $student->FullName = $request->input('FullName');
   
          .
          .
          .
          .;
        $id = $student->save();

        //$user = User::find(auth()->user()->id);

        if ($id != 0){

            $condition = $request->input('subject');

             /*$student->subjects()->create([
                 'subject_name'=>$request->input('subject')
             ]);*/

            foreach ( $condition as $key => $av){
                $data =array([
                    'subject_id' => $request->input('subject')[$key],
                    'subject_name' => $request->input('subject')[$key],
                    'topic_name' => $request->input('topic')[$key],
                    'Price' => $request->input('Amount')[$key]
                ]);
                $student->subjects()->attach($data);
            }
        }
        return Response()->json($student);
    }

via Chebli Mohamed