Just happened to surf on QuizMD: http://quiz.md
It was created to help students help each other succeed, to collectively scratch each others' backs. Education doesn't need to be difficult. Take control and make it yours.
I found it simple and very well organized. It supports also a variety of websites with the same format such as dermstudent.com, emcases.com and plasticstudent.com all from the University of Alberta.