Doing your Homework
You must always remember that interviews are biologically stressful situations. I mean, who wouldn’t get stressed? You are given x amount of minutes to prove to someone, who you do not know, that you are exactly the type of person they need. Terrifying, but that’s why you do your homework. You wouldn’t expect to pass the technical portion of an interview without having studied in advance, so why would you think that you could pass the behavioral part without studying? No matter how personable you are, it is crucial that you research the organization, study the values that the organization rests their laurels on, and practice how you’re going to respond.