Go in there and be yourself (unless you're an arrogant prick). They hire you as a person first. They want to make sure they can sit next to you for a few days without any issues. And as stated previously, read the gouges on aviationinterviews.com. They are absoultely 100% accurate. As long as you have the basic concepts and understandings of the things they want to know, you will have no problem getting hired. Best of luck to you!