Just a bit of advice, the Barron and Arco study guides really focus on the math and mech comp, both of those sections were FAR easier than the study guide, the one to watch for was the Aviation Supplemental I think I have like 4 questions in regards to FAA classifications of aircraft, I'm even involved in Naval aviation and had no clue, so study up on the aviation stuff, fooled me and I've been working as an AE for 3 years now.