We've all had different experiences but, I personally thought the BC Bio was too easy and the BC PAT was much harder than the the actual DAT. I'd say for your PAT, expect around 1-5 points higher on the actual DAT.
FWIW, on my actual DAT my lowest score was Bio and my highest score was PAT.
For QR, don't overthink the problems, and I'd recommend doing the work by hand as much as you can, because believe it or not, using the on-screen calculator take longer! Idk just my experience.