How much time do you have left? I don't have M2 experience to speak of, but if you're short on time and feel weak on the basics, you probably should focus on learning the physiology associated with classic pathological disorders, which often is very demonstrative of the physiology.
If you're really weak on the basics, and have a little more time, BRS Phys is good to get you organized but it's not going to explain anything to you in a way that's going to stick. If you have time, I would go through BRS and pull out a bigger textbook when something important comes up that you don't get.