I didn't take the kaplan course. I had an old MCAT book that I used to review and had the topscore pro and the small kaplan OAT practice test book. I'm disappointed in the RC and QR scores I got because when I was taking practice tests I was getting 380-400 on both sections. I ran out of time in both sections on the real deal, but that was partly due to the fact that the screen would take time to load the question everytime I clicked next.
Overall, it was a happy medium between the Kapalan/topscore pro tests and the opted practice test. Just keep an eye on your time on those sections and you'll be fine!!