Bring a B.S. Detector and set the sensitivity way down so it's not always honking.
Also bring some kind of tape that doesn't irritate your skin to hold your eyelids open when they put you in the rest-deprivation-simulator. That's really the only "sim eval". It's a white cube about 2.3 meters across inside which they can rapidly simulate days of reduced rest and schedule changing, up early-then up late scenarios. The only outside stimulation that's allowed is from two sources. The speaker in the floor that duplicates several popular cell phone ring tones and when you push the answer button (if you can manage--remember you're being tested) it says "First Officer ______ this is Pam in scheduling" over and over and over. The other stimulation source is a little slot where small, 2 day-old sandwiches are shot at you at breakneck speeds. If you can catch it you can eat it. And if you fall asleep they send a huge pissed off FA in to wake you up with a cattle prod. That's why I'd bring the tape.
This is to evaluate how you will be able to cope with life on the line at PSA. Naturally they don't want to spend their training money if you can't hack living the dream.