I took the PR course. Here's the DL on their stuff. They give you a really hard exam (481) in order to scare the hell outta you and make you study your ass of for the MCAT. This is also the exam that they use as a recruiting tool. I believe I scored a 16 or 17 on it. As the course progressed I took 482..3..4..5. Frankly the exams get easier. However NONE of the PR exams are representative of the actual MCAT.
I also took exams from Flowers, Columbia review, Kaplan, and the AMCAS exams. In total I took 23 full length MCATs prior to the test. Here's what I found...
Don't look at the scores. The only exam that will accurately predict your MCAT score...is your MCAT. I scored a 30 on amcas 1. a month later a 29 on amcas 2, then like a 31 on 3, 32 on 4, and a 27 or so on amcas 5. My actual MCAT score was much higher than what I had scored on any of the practice tests.
Use the AMCAS exams as a predictor of the types of questions that you may see on the actual MCAT. Make sure to really understand what they are asking. After a while you'll see that they are focusing on certain topics. Know those topics inside and out. Don't just take the tests and score them...better yet DON'T score them at all. Learn what you missed, and why you missed it. Go back and re-learn the topics associated with what you missed.
Good luck.