Well, obviously for the science section, the more studying you get done, the better you will do. For reading comprehension, QR and PAT, the key is practice. Even people bad at these things will do very well if they have enough experience solving these types of questions. For QR for instance, if you have seen a type of question over and over again, the more you do them, the more you will understand the solution. Also, the more you practice, the faster you will be able to complete the section, which is pretty important. The only part you can't really prepare for is angle ranking on PAT's (after tons of practice, I still sucked at it, and felt the practice questions were too easy on that part). For me, angle ranking had alot of luck involved, but for the rest of the exam, the more you prepare, the better you will do.