Look at this great feedback from a teacher who was just checking the technology...
"We were going to see if we could log in if the unity player had been installed on all our machines. It worked really well, so we went ahead and did the first test. It went quite well. No real problems. How long do we wait until the class takes the next test?"
Of course this teacher had collected consent forms and entered students into our system so they would have logins and passwords. But look how easy it can be!