If it helps I took the ASTB on July 22nd. Took the paper version (didn't want to deal with computers and take the risk of them being slow), ended up being Form 3.
I haven't gotten my score yet from NOMI, but I think I did really well. The math section I definitely rocked, as well as the nautical/aviation section. Reading, mechanical comprehension and spatial were not that bad either. I'm confident I did well. I used..
-Marine gouge..really really good, basically mimics the math, mechanical and nautical/aviation sections
-ARCO Military Flight Aptitude Test Book..pretty good for the aviation/nautical and the spatial sections (though I feel like the spatial on the real exam is a little trickier), the math/reading sections will NOT prepare you for the real exam in my opinion.
-the ASTB Mechanical gouge..once again, really good for brushing up on those basic physics principles for the mechanical section
-if you're going for SNA like me, I used the FAA Pilot's Handbook (
http://www.faa.gov/library/manuals/aviation/pilot_handbook/), might be overkill because I don't think the exam goes into that much detail, but couldn't hurt to gain some really basic insight on planes right?
-Aircraft for Amateurs (
http://www.globalsecurity.org/military/systems/aircraft/intro.htm), really really good for understanding the basic principles of flight (AOA, parts of a plane, etc.) good for the aviation section
-this website (
http://www.boat-ed.com/wa/course/p1-3_boatparts.htm) is good for learning the basic parts of a boat
-last but certainly not least, this members gouge served me really well when I was studying for the ASTB, if it's one gouge that you should study from, its this one, I don't have the link, but search the forum for atrickplay's gouge, credits to him cause it's one hell of a study guide. it covers all types of math questions and ways to solve them, aviation knowledge, meteorology, nautical knowledge, spatial...you get the point, use it. I highly recommend it.
Good luck.