I've had some experience with TBR, so I can put my two cents in. The Berkeley Review is great in that ALL of the problems in their books are passage-based. You get all of the info in it that you'll need for the MCAT (a lot of the time, even more than you need) and the passages to boot. Every section in the book has about 10 or so passages that give you a total of 100-125 questions per section, so there's tons of material to work with. I guess an advantage to having the discretes is testing your recall and not necessarily your ability to analyze information given to you. But it's essential to get your brain in passage-mode. If you don't have them but can get them, get the TBR books.