I found Kaplan's bio and chem to be much more difficult than the actual PCAT. I had roughly 10 minutes leftover after both the sciences. The reading and math on the PCAT were harder in my opinion compared to Kaplan's practice exam. I almost ran out of time on the reading and i had to guess on about 10 math problems.
As far as content, it's a mix. I will say that Kaplan certainly over prepares you for the sciences. Dr Collins is probably on par as far as difficulty is concerned.
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