I'll chime in, I personally took the Kaplan online classroom class all summer and I honestly felt like it was a waste of time. The books are medicore with Physics and verbal being complete messes and the 3 hour sessions realistically were completely worthless. I can genuinely say that had I spent the time I spent doing the self-studying I did the last 2-3 weeks after the course I would likely have been significantly more prepared for the mcat.
In my opinion your best options are to, 1) get a decent set of books EK101, EKBio, Nova Physics or TBR Physics + Chemistry, 2) Subscribe to Chad video's ( His videos were a major help and communicated a lot of logical ways to remember physics and chemistry), and 3) give yourself at the very least 2 months to study.
I can't say anything however about Princeton review, but I have heard that their books are better.