It's kind of like a hit or miss with the math section on the PCAT. My practice tests were challenging but not impossible, while on my real exam, it was ridiculous. So many of them were tough calculus ones that took a lot of time like optimization and related rates (stuff I never looked over), yet I still got a 99 percentile on the math so maybe that while the exam is really hard, it's scaled so you can still do well. The practice exams will help you a lot, though, with timing the math section since it is, in my opinion, the hardest section in regards to finishing on time.