It actually prepares you quite well. While you need to practice test taking strategies, you will be well versed in the actual basic science requirement.

I think that there are many schools out there that are glorified Kaplan courses, which I think is a tragedy. Medical school is not there to help you pass a standardised test. Medical school is there to provide you with a medical education, and a standardised test is a tool to verify that knowledge.

If you go to Charles and do well, and do a moderate amount of self preparation for the USMLE, you should obtain an excellent score.