Know why you want the job. Be able to express, specifically , the marketable skills you have to offer the organization. Be prepared to answer that killer question. Know how to deal with illegal questions tactfully during the interview. Line up your references in advance and verify that they will be good ones.
Presentation Find out the standard dress for the organization.
Dress on the conservative side. Bring extra resumes, notepad, pen. Be sure you know how to pronounce your interviewer's name correctly. Be polite to everyone you meet there. They all count.