my variable is not being passed to my view

im using two tables, so im using two models

this is my controller

namespace App\Http\Controllers\PastPaperControllesr;
use App\PastPapers;
use App\DropDown;

use Illuminate\Http\Request;
use App\Http\Controllers\Controller;

class IGCSEController extends Controller
{
    /**
     * Display a listing of the resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function index(Request $request)
    {
        $items = $request->items ?? 1;      // get the pagination number or a default

        // $club = Club::findOrFail(session('club'));

        
        // $pastpapers = PastPapers::all();
        $paper = PastPapers::orderBy('Code', 'desc');
        $pastpapers = $paper->paginate($items);
        $past1 = $paper->paginate($items); 
    
        $filters = DropDown::all();


        return view('pages/pastpapers/igcse')
        ->withPaper($paper)
        ->withPastpapers($pastpapers)
        ->withItems($items)
        ->withfilter($filters);
    }

    
    

    /**
     * Show the form for creating a new resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function create()
    {
        //
    }

    /**
     * Store a newly created resource in storage.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return \Illuminate\Http\Response
     */
    public function store(Request $request)
    {
        //
    }

    /**
     * Display the specified resource.
     *
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function show($id)
    {
        //
    }

    /**
     * Show the form for editing the specified resource.
     *
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function edit($id)
    {
        //
    }

    /**
     * Update the specified resource in storage.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function update(Request $request, $id)
    {
        //
    }

    /**
     * Remove the specified resource from storage.
     *
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function destroy($id)
    {
        //
    }
}

this is my model

namespace App;

use Illuminate\Database\Eloquent\Model;

class DropDown extends Model
{
    //table name
    protected $table = 'igcse_subjects';
    //primary key
    public $primaryKey = 'id';
    //timestaps
    public $timestaps = true;
}