If its a behavioral interview, PRACTICE BEHAVIORAL QUESTIONS! This is easily done with a quick google search. You want to practice a list of those questions. It all has to do with experiences in your past. Think of the complex projects you've worked on (these will allow you to answer many questions based on a single experience), tough situations and people you have handled, times when you went the extra mile. Also think of tough questions you might be asked, like a gap in your resume, or reasons why you made certain decisions in your career/education, etc.
They key is to have as few surprises as possible in the interview.