I don't know what text books are used at your school, but I would recommend you drop by their bookstore, see what book and author they use for A&P (Anatomy and Physiology). Then, go on ebay and find a used book that is a version or two behind. The books typically don't change much, it will allow you to get a head start on what can be a very difficult subject for some people, and buying an older, used edition from ebay can be quite cheap. I picked up A&P by marieb (6th ed) for only $14. It is an edition or two behind, but I can get a head start and even if I can't use it for class, it is only $14.
Definitely stop in and speak with an adviser and see what they may recommend.