The Princeton Review practice tests (A-D) are pretty tough. When I took them, I did terrible on the first one and slightly better on the second one. They seemed like a confidence breaker to me, so I skipped the last two and focused on the AAMC exams instead. I ended up with a 37Q no thanks to Practice tests A-D. Just practice with the AAMC exams if you can. And remember to be confident because that is the key to success. 🙂