These activities have been created to allow you to put into practice the skills listed under each skill level. The only way to become proficient in the use of Google is to actually put it into regular use.
Collecting data from a form is one of the primary functions. Create an exit ticket to use with your class that will collect information like (name, period, and some kind of question that checks for understanding). Post the link to this form in your Google Classroom as "material". Have students access this link as they prepare to leave your class when you would like to collect info on their understanding. Using this as a part of a routine would seem to make the most sense.
Create a quiz to use in an upcoming class. Be sure to set appropriate point values, correct answers, etc. Assign the quiz through Google Classroom. Use the Lock Down browser feature to ensure students have to stay in the quiz while taking it.
Create a non-traditional form activity to use with your students (i.e. digital breakout, choose your own adventure, more ideas).