Stop studying 2 days before the test. It's not gonna help anymore. Shoot I stopped studying the week before cause the idea of taking another practice test made me want to vomit.
Go work out, eat a ton of almonds and fruit (won't do much but they taste good). During the exam, make sure you bring earplugs and trailmix+gatorade. Take every break and force yourself to eat a few handfuls and drink a good amount. Also be sure to pee every break even if you feel you don't need it.
If you know your weakness is psych, and you really still want to keep grinding the axe, at this point stop studying everything else and spend the last few days reviewing all your previous practice tests and the all the psych questions you got even the ones you got right. Then do more practice problems in psych.
When you take the test, remember it's standardized and that you'll score similar to what you got on your practice test no matter how much more "difficult" this particular one may seem. They always feel more difficult on test day. That's just nerves firing.
Good luck!
