How to Face interview first time

Hi guys!I am doing Final Year Engineering.I am attending so many campus interview in my college right now.I was not able to get through it up to now.so,students who are attending interview will not know how to prepare for interview for first time.Here all the few tips which is really needed
Do's:
1.you should be very optimistic and more self-confidence.This is very important face any interview.
2.Dont think to much about your competitor strength.You beleive yourself and your strength.
3.Wear perfect Dress code for interview.
4.you should find out your area of interest and well prepare in it.
5. Prepare for aptitude and Group discussion round.Know about the company which your are attending.
6.Have cool mind.
Dont's:
1.Dont lose confidence at any stage.
2.Dont get nervous.
3.Dont late for interview.