When I took the test 2 years ago, it was a known fact that Kaplan sucked compared to Dr. Collin's. The only thing that Kaplan had on Dr. Collin's was its massive biology section that blew Collins outta the water. Everything else was just bad; the math section was garbage, chemistry had facts that didn't show up on the exam, blah blah blah. I don't know about now, but if you want to have a good idea on what is expected on the PCAT (especially the chemistry section since that is worth a lot more than the others), go with Collins all the way. If you want an even better idea, get the official practice tests and take those a week before your next exam. That should be enough preparation from now until November.
Off - topic, but rather than just memorizing the information, integrate it and understand why something works the way it does. Look at the big picture.