the Kaplan book is definitely a good tool to use to study for the pcat. However, some of the questions on there are a bit more complex than on the actual exam. Also the barron's book is a good one but it tends to be easier than the real pcat. In addition to these i used some of the online tests that are offered through harcourt. Overall, try to use all of these sources because the more practice exams you take them more comfortable you'll be when you are taking the real thing.