Are you talking USMLE or MCAT? I am assuming USMLE because of the forum you are in. While I will only be a first year at the U of M in the fall, I did take the MCAT prep class through Kaplan and found it to be amazing, so I would definitely say that they have a good system there. And, I have heard good things about their USMLE programs too from students and I plan on using them in the future.