Warming up with a game before usually helps me get in the zone and jolt me out of whatever mental space I was in before. On test day I plan to get to the test site early and do a couple games in my car so I don't warm up on the real deal.
@paul1234 you have until the night before to withdraw but you would lose your money. I guess it's not a big deal now anyway because the takes are now unlimited. If your school only takes the highest score you're good.
Hey Gary, it may not be the same deal for everyone, but it is possible for your test date and test center change. The original acceptance letter states this. I'm waiting to find out about this and am pretty nervous myself.