Oh yes, I'm a big believer in psychological preperation before this big test, I did it too. I made sure to eat well the few days before, meditate a bit and relax. Also, I started working out like crazy when I first started studying for my second testing. I think having a healthy body translates to a healthy more efficient functioning brain as well. I also did some music therapy stuff on the drive to the test building. It did help, it was the second time I took it. Ended up 6 points improved in a respectably competetive range.
As for the first time I took the test, there were so many things that annoyed me. Probably number one was that I was not prepared and was very psyched out about it and fearful...not the way to meet this challenge. When I was in the test room, there was this girl who talked so loud that even when talking to one person, the whole room could hear her. She talked about how great she did on practice tests and all that crap, then she proceeded to sniff and cough and talk about her cold. During the test she seemed to cough continuously. Not a mild cough, but one of those loud loud hacking AAHHOOUGAHH type of coughs. I could not concentrate due to her loud coughing. I'm sure she could not help it, but it was annoying. My being underprepared probably compounded the annoyance. I believe if you are thoroughly prepared and mentally and psychologically prepared, the little annoyances don't seem to bother you to much. I don't think I even payed attention to anything but the test itself the second time...focused.
Good luck everyone!