I'll be man enough to post my scores, although I'm not exactly happy with a few of them.
Pearson Practice PCAT Test #1
Writing - N/A
Verbal Ability - 60-80
Biology - 61-81
Chemistry - 83-103
Reading Comprehension - 3-23

Quantitative Ability - 80-99
Composite - 66-86
Pearson Real PCAT Attempt #1 (July)
Writing - 4.5
Verbal Ability - 70
Biology - 97

Chemistry - 93 (never took organic or biochemistry)

Reading Comprehension - 47

Quantitative Ability - 45
😡
Composite - 84
😀
I would say the the practice test is relatively accurate. As you can see, my verbal, chemistry, and composite feel where they should. Unfortunately, my quantitative fell to the basement and my reading comprehension didn't get much better, but my Biology went through the roof.
Obviously many things can happen and if I were taking the test again, I would definitely put more effort into doing math with lots of transcendentals and focusing my attention better on the reading comprehension (didn't expect people to be pounding out their essays while I was reading

). You'll be fine! I had friends who scored well above what they were expected to get,however, I also had friends who scored much lower than they wanted. I used Kaplan but I'm sure most of the guides are the same. You can only study so much for these exams, if you feel you've studied all you can, just keep reviewing material until exam day.
Also for your reference, most people don't get these high 90th percentile SDN scores. Only 3 of my friends even broke 400 while the rest fell below. A 70th percentile score would be very respectable if that's what you ended up getting.