Dress properly:
A skirt below the knee/ pants to your ankles, neatly pressed with an ironed top should suffice.
Bring copies of your resume:
along with transcripts & questions you may want to ask your interviewer.
Speak at a good pace. Not too fast/slow.Practice answering questions they may ask in the mirror.
Don't avoid eye contact.
Don't keep looking around.
Keep good posture. Sit up, don't slouch.
Ensure you give a firm handshake to your interviewer before the interview starts.
Be confident.