How do I get the data of the child of the parent's child? Laravel Eloquent

The parent is Exam, the child of Exam is Question, and the child of Question is Choices

I wanted to display all questions of this certain exam (exam_id) with its corresponding choices.

Exam Model

public function questions()
{
    return $this->hasMany('App\Questions');
}

Question Model

public function exams()
{
    return $this->belongsTo('App\Exam', 'exam_id', 'exam_id');
}

public function choices()
{
    return $this->hasMany('App\Choice');
}

Choice Model

public function questions()
{
    return $this->belongsTo('App\Question', 'question_id', 'question_id');
}

In Controller

$all = Exam::with(['questions','questions.choices'])->where('exam_id', $examID)->get();

I don't seem to get the desired result. It throws an error of Class 'App\Questions' not found. I just started laravel hope someone could help me out. Thanks.

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