Laravel paginate not working in certain query but works in other query

Question

As I am now putting a lot of data in my database I needed to use laravel's paginate. However, it doesn't seem to work in my other query. Is there other way? or what did I do wrong?

My code is shown below

Paginate Working (ExamController)

$exams = Exam::with('users')->where('id',$userID)->paginate(5);

Paginate Not Working (Questions Controller)

$questions = Question::with(['exams','choices'])->where('exam_id', $examID)->paginate(5);

Code to display pagination

{{ $exams->links() }}   ---- exams view
{{ $questions->links()}}   ---- questions view

Error

Call to undefined method App\Question::links()

View

<div class="card">
  <div class="card-body">
    @foreach($questions as $index => $questions)
      {{$questions}}
    @endforeach
  </div>
  <div class="mt-3 d-flex justify-content-end text-right">
    {{$questions->links()}}
  </div>
</div>