Pie
At risk of being flamed, you can get some idea of what the FAA ask because the question bank is in the public domain (Freedom of Information Act and all that). Answers are not provided, which is a shame as sometimes its not obvious what the correct one is
<a href="http://av-info.faa.gov/data/airmanknowledge/atp.txt" target="_blank">FAA ATP Questions</a>
Have fun....