If you are looking for a technical prep guide I would recommend
Airline Pilot Technical Interviews by Ronald D. McElroy, its a great book to cover those commonly missed topics and even some good "gotcha" type questions. If you are looking for a place to start your studying from scratch check out this guide http://airlinepilotmentor.com/technicalinterview.aspx

Its not the answers but it will get you into the books in the right direction.

Good Luck