This idea has been done before by a site called KnowledgeBlackBelt, formerly JavaBlackBelt--although the idea is heavily perverted in its current incarnation. T

This idea has been done before by a site called KnowledgeBlackBelt, formerly JavaBlackBelt--although the idea is heavily perverted in its current incarnation. The site works on the concept of tests and courses. The test questions are submitted by users, but to take the courses you need to pay for an instructor of some kind to teach you. Completing tests moves you up ranks. I contributed to a few questions a few years back before the site introduced this paid instruction aspect. A lot of good material was created through crowdsourcing. I am sure it could work again.