If you use Google Forms for assesment you'll want to check out Super Quiz

Super Quiz adds brilliant functionality and assessment tools to a quiz made with Google Forms.

Source: Super Quiz – Google Sheets add-on

Super Quiz adds the ability to auto grade quizzes, provide item analysis of questions, and personalized feedback to students. Although it takes a little bit of work to set up, it offers a lot more than what is built into Google Forms.

Here’s a video to show what it is and what it can do:

https://youtu.be/jbDPh0SMer4