If I were to count how many interviews I've attended I'll overwhelm myself, but they're A LOT!
and my recently graduated friends are coming to me for tips about interviews since I started working at 19.
So the kind of advices I give are....

Be Well Prepared
Know about the company, the position you're applying for, do some googling, know yourself and how can you add on to the position, prepare your CV, run scenarios and prepare questions.

Come Ready
Dress well, smell well and feel great wither you got the job or didn't, take it easy!
Listen, talk, answer and ask questions.
Get to know your interviewee and always show interest.

Ask for a follow up
If they don't inform you in the interview if you made it tell them "I shall be expecting an email or a call".

Stay True To yourself
It can be important to get a job and get an income just don't drop all the standards.

Just a few; but they cover just about everything in any interview.