As mentioned above, Crash Course is a life saver. I listen to it on my drive to and from work everyday to reinforce information. But, I feel that the best thing I have done to prepare myself for A and P is taking a Medical Terminology class. A lot of people thing it is unnecessary, however the class at my Community College is 16 weeks, and it goes over each system in its own chapter and has been a life saver. You learn the different parts of the system, basics of how they come together to work, common tests and disorders related to each system. We focus on how to break down a word to find it's meaning so you don't memorize 150+ words a chapter - just basic word parts. If you don't want to take it in a class, the name of the book is The Language of Medicine. Best thing I ever did!