Don't be nervous, be confident that you will succeed beyond measure, keep a good mindset, also eat a healthy breakfast.
Make sure you've gotten a good night sleep the night before. Don't skip breakfast. Make sure you know your beans. Read up on the organization that you're interviewing for...be knowledgeable about it; it will help you answer questions and to know what questions to ask. Rehearse the things you want the interviewer to know about you; know it cold so that you don't forget anything. The better prepared you are, the more confident you'll be. Good luck!
stay calm. be yourself. don't be overly nice because that always comes off as phony and makes people think twice about who u really are. just be urself:)
Stop drinking alcohol at least six hours beforehand. Take a bath and put on fresh clothes. Be there on time.
Wisdom > knowledge. Don't talk about what you know, talk about what you learned. If they ask about a weakness or an example from your past, talk about what you learned from it. It makes you seem wise, like someone who is growing all the time.
Don't worry , you probably won't get the job anyway........no just kidding.......