physics MCAT

I have been doing practice problems and I am nowhere close to where I need to be with my March MCAT date approaching. I think I am missing fundamentals that are not allowing me to really grasp these problems even after I work on similar ones. Is there a student friendly physics book/txtbook you all can recommend??? I am in the middle of a Kaplan course. Most have advised that I just keep working on problems but I am running out of problems.