I think a deliberate study of macroeconomics would serve you better in taking the exam. When I took it (a dozen years ago), I was surprised how much of the exam was purely economic in nature (fiscal policy impacts, net trade deficits, etc.). The historical questions really focused more on organizations (e.g., what ASEAN and OPEC stood for) rather than any military campaigns.
Good luck! After you pass the written exam, they'll invite you to an oral exam; pass that and they may make a job offer.
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