I got 670/800 on GRE verbal, and that was 94th percentile. But 750/800 on quantitative was only the 81st percentile on GRE. In fact a perfect 800 was only the 92nd percentile. So 92 is the best you can do on GRE quantitative. There is no precalc or calculus on GRE quantitative but just arithmetic, algebra, and geometry like the SAT. However, the verbal GRE is harder than verbal SAT for sure.
So that goes to show you that GRE verbal is hard, but probably not as hard as MCAT reading ability.
PCAT, I have no idea.
To study for the GRE verbal, I had an old GRE Big Book of 27 practice tests. I worked the first 5 tests slowly, and tried to understand the logic of the answers. Why certain answers were right and why were wrong. That is especially important as you try to figure out the "close" answers and choices on the reading section that seem true but are the wrong answers. Get as many PCAT books as you can and TRY TO UNDERSTAND why the right answers are right and why the wrong answers are wrong. I eventually did practice with all 27 tests and tried to understand the test as well.
It is helpful to get used to the traps in the questions and that is what you can do to raise especially your reading score, and even your verbal as well.