I don't think you need any books to prepare. It has fairly basic instrument flying questions. At least 5-10 questions are from approach plates, know how to read them; holding speeds, some airspace info, speeds above and below 10,000; icing is a BIG one considering the plane's history, they have a few questions on that; Holding entries and speeds; what is MIN FUEL; inebriated crew member; incapacitated crew member (declare an emergency and land asap); some thunderstorm related questions. It is timed and on video. I think its more than enough time to get through these questions if you remember these things. If you havent flown or studied in a while, brush up on your instrument knowledge and you'll be fine. Let me know if you have any further questions