To get ready for my interview I made a teaching portfolio. Even if the interviewer doesn't ask to see the portfolio, you can use it as a resource when asked various questions. I filled the pages of my portfolio with all of the things that I have accomplished as a teacher. You can add student work samples, worksheets, parent notes, assessments, etc.
(just a few of the pages I put in my portfolio)
Your portfolio should give the principal a clear picture of what you can bring to the school. They should be able to imagine you and your classroom in their school.
(click the picture to view product)If you happen to be getting ready for an interview and need a little help I put together a unit with lots of tips to get you prepared. Like what to wear to you teaching interview! Most importantly it includes 87 of the most common questions asked during a teaching interview.