After registering for the Foreign Service Written Exam, I have been researching study methods online obsessively. I've purchased the practice test offered by the FS. For me personally, I think the Job Knowledge section of the test will be the most trying as it's so difficult to study for and hard to know specifically what it contatins. I'm hoping my English skills will help me pass. The mystery that is the biographic section is pretty much up in the air, as far as I'm concerned.
I'll be brushing up on my constitution knowledge, going over landmark Supreme Court Cases, and studying an AP US History book I found that seems pretty good.