Yes,I understand to add user and mail...but if I do it myself by using collaborators then it needs to be done BEFORE student can take the test.
What I understood from reading docs help that when student takes test then it pops up window with username(if he doesnīt have Google account) and mail to fill in. I was testing different options and result in spreedsheet is always the same anonymous-can see only answers and date/time.
Could you be nice to explain exactly how to do so since I donīt seem to find that solution,please?