Think of a few questions you're sure your interviewer will ask and already think of how you're going to answer them.

Tell us about yourself. Why did you apply here? Why did you leave your last job? Where do you see yourself in five years? What salary range are you expecting?
Almost all interviewers will ask basic questions like this. Think hard and deep about what you're going to say.Knowing the answers to these questions will give you a few less things to worry about on the big day.