Dressed to impress
Dress in any appropriate outfit that mirrors their professionalism. Just remember to keep it simple, but elegant--Men in business suits, or shirt and slacks; women in pant suit or blouse and knee-length skirts or long pants.
Mind the time
Avoid planning for an interview during your lunch breaks or during any short breaks in between in order not to rush over things. You may get all panicky and lose your focus should you need to dash here and there for the interview.
Be careful of what your body language speaks
Greet the interviewer with a strong, firm handshake as a start. Don't hunch and remember to look at the interviewer in the eyes. These small gestures leave a lot of obvious clues to the interviewer about you and your confidence.