Google Help: Forms
Creating a Branching Quiz
"Save as Doc" (save Form results in a Doc)
Form Redirector
Automatically Issue Certificates When Students Pass a Quiz
Add-Ons: Form Limiter, Choice Eliminator 2, Form Notifications
Doc to Form Add-On
Making Google Forms Quizzes with Math
5 ways to prevent students from sharing a Google Quiz?
EquatIO® for Google: How to Use in Google Forms