The "stickies" at the top of the forum are pretty accurate as far as the actual test is concerned. Practice on jeremeyjustice.com's game section for the ATC Scenario and the scan section. I never did find a practice "game" for the letter factory, but it seemed pretty easy to me, except for the awareness questions at the end (where a practice test wouldn't help, anyway). The applied math, angles, and dials sections were stuff a 7th grader could do. The analogies section was a little tough for me, at least the word analogies. I think you are either great at that sort of thing or you're not. The picture analogies seemed much easier. The analogies section was the last part of the test and I was ready to get out of there too, so I don't know if that had anything to do with it.
The The only thing that i would suggest that everyone else seems opposed to is dressing comfortably. You do not need to go in business casual attire. That being said, you also do not want to go in with a tank top and flip flops. I wore a pair of shorts and a nice polo shirt. The people administering the exam are just that: administering the exam. They are not giving you the interview and they have no bearing on whether you get hired or not. The only thing you need to impress them with is your test score. So if you feel most comfortable in jeans, wear jeans. More comfortable in a suit? Wear a suit. Just remember, you're going to be in there taking this (pseudo-stressful) exam for up to eight hours. Also, relax and don't stress about the exam. It is easier than you think it is.