I really like the idea of using this site and its battery of questions as a way to check my own understanding of the physics that I am learning. However, the big problem is that I can't seem to filter out questions from high school, junior-undergrad, senior-undergrad, graduate and research-level questions. I think it would be a huge plus to have such a filtering mechanism.
Think about it.. you could simply log in to stackexchange and pick out all senior-undergrad level questions in QM or classical physics and have a ball of a time the night before your exam.
Please look into this.