Took the ASTB recently and wanted to share my score and study program as a way to give something small back to this forum that proved so very helpful. I should start by letting you know I'm not applying for an aviation slot (sorry prospective flyers), so I only took the OAR portion. Test form was number 5, my first attempt, and I got a 65 OAR.
In general, the math portion of the test was much easier than I anticipated (although I know I didn't get a couple of them); reading was somewhat more difficult, but that could be the difference between reading on a computer screen as opposed to my printed practice tests; and mechanical was about what I expected.
Materials I used to study, and my take on each resource from an OAR portion perspective:
-Barron's Flight Officer Candidate book: math practice tests were pretty similar to actual in terms of difficulty. The reading tests in here include definition and word choice question types that did not appear on the actual, which is all paragraphs. Mechanical seemed about right too. Appreciated the long sets of practice questions - not tied to a particular test, but a type of item.
-Peterson's Officer Candidate and Military Flight Aptitude Test books: math practice tests were much trickier and heavier on word problems than actual. Flip side is, better to be over prepared than not! Reading and mechanical were both about right. Officer candidate book had two practice tests, but lacked the flight material in the other book. No overlap between the practice tests so I used them all.
-Gouges and sample questions found in this forum thread: super helpful! I read the one by user Atrickpay once or twice a day in the two weeks before my exam just to keep the principles fresh in my mind. Saved a PDF on my phone for easy access any time I had a spare moment.
Overall, I studied for the exam for about 3 weeks. A scheduling mishap pushed my date back another 2 weeks, which I think helped me out a lot. I would basically do a quick bit of studying or review almost every day, with 3 or 4 longer sessions each week to do practice test problems from the books. Definitely take all the non-ASTB practice tests too, the AFOQT had lots of similar math problems!
I'm a competitive guy who likes to be good at things - who doesn't? - and I had hoped to score higher. My mentality going in was that I should be capable of answering every question correctly and obviously I fell a bit short. That said, I understand from my OR and this forum that 65 will take me where I need to go. As for my future plans, I intend to submit for the October IDC board because I'm an old guy and can't make a SWO board before I turn 29. And, I'll probably need more time to fill out that SF86 form than I spent studying!
Good luck to fellow ASTB test preppers out there!