Thanks to everyone on this site who posted gouge and tips. I just wanted to give back a little.
I took it today for the second time. The computer crashed twice during the test, which was kind of scary the first time it happened, but then I just got used to it. I'm a prior corpsman going through sta21, and I'm applying for NFO.
I went from a 5/5/5 53 to a 7/7/7 59. My GPA is 3.15 and I'm a double major in history/philosophy. Atrickpay's gouge, the "dear OSO" thing, and the Arco book were helpful. So were some of these links and pdfs:
http://www.technologystudent.com/gears1/geardex1.htm - man those pulleys still kick my butt
http://www.carolinamarineofficer.com/files/ASTB_Study_Guide.htm - lots of good stuff
http://www.linnbenton.edu/auto/day/mike/read.html - micrometer practice
http://www.nelnetsolutions.com/dod/Default.aspx?sponsor=12894 - Petersons Study books for free if you're DoD
http://www.youtube.com/watch?v=1Cq7hf4ylvY&feature=related - motivation for cram breaks
There are so many other sites I used to study, but I didn't post them all. One insight that I can give you (I'm not a math guy - hence my majors) is to develop (and memorize) a standard procedure for every kind of problem they throw at you in the study books. For instance, if it's a vat draining problem, I know that I need the rate in and the rate out to get the total rate of flow. The gallons divided by the flow gives me the time remaining.
Also, just doing basic SAT math was pretty helpful, because us older guys tend to forget basic stuff like adding fractions.
For the aviation section - wow there was a lot of detailed questions that I could only guess on and weren't in my study materials. That's why people recommended starting to study a long time in advance. If I could go back, I would have bought the FAA handbook and read it before bed every night.
I think the best way to do it is to take it twice. Write down all the questions you can remember, continue studying, and take it again with your reinforced knowledge. A lot of it was the same, even though they were different tests.
Good luck,
Samuel