script for admob

There is a script “RandomLevel”

using UnityEngine;
using UnityEngine.SceneManagement;
using System.Collections.Generic;

public class RandomLevel : MonoBehaviour
{

void Start ()
    {
// DontDestroyOnLoad( this );
if (SceneMixer.SceneCount == 0)
SceneMixer.Recreate();
    }

void OnMouseUpAsButton()
    {
switch (gameObject.name)
        {
case "Skip":
SceneManager.LoadScene(SceneMixer.NextScene());
break;
        }

    }

}

RandomLevel needs a reward for viewing admob ads, when you click on a GameObject on which the collider stands.
Help me Please!
Thanks.

Definitely start from the sample code that came with the AdMob SDK you installed.