Want to reiterate what a few others have said - the Barron's guide is a game changer. And, time your practice tests. The Barron's guide has a few - I took one not on the clock and one on the clock and it's no joke a quick exam.
Maybe it's been said before, but there's an online suite of tests here (hope the link works): https://www.nelnetsolutions.com/dod/DODHubPage.aspx?sponsor=12894&HubPage=10064
My recruiter said I was ok to register even though I was civilian at the time.
Lastly, I think the test specifically had us sign a non disclosure (this goes for TBAS as well). Maybe the format changes (does it?) because too many people discuss the specifics? My copy was many years old (tested in fall 2011) so I don't think it changes often. Everything you need to know is in the Barron's book.
For what it's worth, my scores were good enough to get a UPT slot and I only had two hours flight time when I tested. I could barely read an attitude indicator before, so obviously the Barron's book was a big help. Push your test date back, if possible, if you're not prepared...you only get two chances. Good luck. PM if I can help.