Well, this is my story. My score was nothing particularly spectacular, (33) but it does show the effectiveness of the the BR books--- given my situation:
I had one month and a half before my mcat 7/18. I had not done any studying prior, and I'm not the genius type that can wing standarized tests. What I had in front of me was the complete set of BR books. I knew that time was limited before the test date, so I always had in the corner of my mind the notion that I would retake the test on some another date. This coming test would be a test run so to speak.
So what i first did was a cursory content review of the all the books, besides the verbal, and did not bother to memorize any facts. This took around 3 weeks. Then I did 9 passages for each section, in all the BR books. The chemistry and physics passages were especially good: they integrated concepts, formulas, and common sense. In my opinion, they were not like MCAT questions but they prepared you for MCAT questions. I hope that makes sense. The best part were the explanations, which were thorough and taught you how to approach difficult questions without panic. They basically outlined the thought processes that a master MCAT taker would undergo as he approached various types of questions. The passages are the stars of the the BR books, though the content review of the physics and chemistry books were also superb. The content of the biology books were surprisingly shoddy and scattered, however. Anyhow, after having gone through the content and through the passages, I did a couple of BR CBTS for kicks. I wasn't in the mood to do them thoroughly, so I went through them as fast as possible. I ended up missing 17-21 per section. = = But when I took the actual MCAT, many questions seemed like child's play compared to the grueling BR questions, which I constantly missed.
So that's my story, nothing too dramatic. I got a 13 on bio and an 11 on physics and a 9 on verbal. I didn't study for verbal and I was confident in my reading comprehension abilities. Apparently, the confidence was ill-founded. If I had more time, I would probably have done better, I think. My advice is to start cracking on the BR ASAP and approach the test with humility. Also, be present while you study the BR review books. They are comprehensive and chocked full of important details and unique ways to approach questions. I started too late and ended up only doing a superficial review of the passage explanations. Due to time, I was constantly looking at my calendar and my watch. If I started earlier with the BR books, took a more conservative approach with regards of time, and did a more thorough review of the passage explanations, I probably would have gotten myself a better score. I do have my regrets, but alas, I'm too lazy to retake, and I'm not the ultra-competitive premed. I just want to become a doctor.
Anyhow, hope this helped! good luck!