I created a video to show how easy it is to run the script once the form is made. However, once I made the video I realized it was a little obsolete. Yes, there is a new way to do this using the Add-ons that recently came out. So I added that video to the end of the first one. That way you can choose the version that works best for you. The update is at the 7 minute, 56 second mark of this video.
I absolutely love this add-on but believe it or not there is more! Yes, there is even more that you can do with your quizzes. Let me know if there is anything specific you would like to do with your quizzes and I'll see if I can figure it out for you.