The CRACK PCAT tests were beneficial for practicing timed examinations. There is a built in timer that you can choose to turn on or off when taking your test so you can work through at your own pace or choose to be timed. You can also choose to take a specific subject test rather than a full length if you are focusing on a specific section (Verbal, Biology, Chemistry, etc.) which I found extremely helpful. The score is given instantly and the best part is that you can retake the tests as many times as you'd like. The biology material was helpful and comprehensive, though it had some questions that are no longer covered on the PCAT (like fungi). It helped me know what to subject areas to focus on mostly microbiology and anatomy. THE BEST PART are the video lessons for the biology because they go more in depth than what just the specific question was asking so you learn more about the subject. The verbal section has video explanations as well, but are very quick, brief explanations. The math section does not have videos yet, but they do have written answer explanations that help. Sometimes the explanations leave out steps, but overall they are beneficial to solving the problems and are very close to the challenging level of the real exam.