Use a combination of both the MCAT review book and your textbooks.
You don't want to simply reread your textbooks. Not only would this be agonizing, it also wouldn't be an efficient use of your time -- you need to focus on the holes in your knowledge, not recapitulate what you already know well.
My method of studying (and I use it in medical school as well) is to rely upon review materials and practice tests heavily, for two reasons: First, to refresh my memory for material that I understand pretty well but that is a bit hazy from disuse (i.e., no problem with the concepts, just the details). And second, to identify areas where I need to do some relearning (i.e., both concepts and details). When these latter deficits appear, I turn to my textbooks and reread the sections in question. Textbooks present information in a detailed, narrative form that helps me understand concepts fully. Review materials, conversely, are usually concise and spare, which makes them perfect for helping you recall the details of material you already understand in theory.
In my experience, the MCAT focused more on concepts than on details, but often you had to recognize the details to be able to understand the concept being discussed. Still, you'll be far better off with a broad, solid grasp of a range of concepts than you will be with a headfull of out-of-context minutiae.
Good luck!