I'm with Tiggidy. You get MORE than enough material with TPR. If you run out, you are studying TOO much. I think some pre-meds can actually study so much it becomes counterproductive.
Also - having the teachers teach you gives you the chance to grasp material that you might not have 'got' the first time around.
In the end, it's personal choice. Some will tell you Kaplan, some TPR. TPR worked really well for me, and I recommend it to anybody who wants to take it.
-chop