Many give a hell lot of tips to be followed or remembered to come out wit flyin colors in an interview.They all are or may be worth.But above all there is a single tip or point that decides whether u r in or out.Its just simple,follow this tip.

1.Be CONFIDENT....Tell your mind that ters no one more suitable for the post ur trying to achieve and u know much more than the interviewing panel.Tell your mind that ters no one to defeat u.

If u try to do this,i bet ur words,deeds actions everything wil change automatically ,and u wil perform well and u wil b in.I am sure.I quote words of the Indian Politician,strategist and writer Chanakya here,'Even if a snake is not poisonous, It should pretend to be venomous'..

Believe me,tis is te greatest tip on earth....

You are right to a certain extent and actually posessing the goods, by that I mean qualifications also helps

ofcoz,qualification matters most.But in many cases people who r qualified fail to get placed somewhere.Thouh they
know al te stuff asked 4 an interview tey fail.Its bcoz lack off acting.Noone lives a corporate life daily in practical life.But companies demand them.. So a sudden shift to a corporate means of dealing things and talking feels diff 4 many.tats y many fail 2 produce stuff which they know properly.. to overcome tat only way is be confident.. wat do u feel frnd?

yes, as long as you know your stuff, act away; hopefully the interviewer is smart enough to know the difference

I'm gonna need to retract what I said above
I dont' think its ever a good idea to act, leave that to Holly and Bollywoods of the world
But if a person is truly qualified, s/he ought to believe they are the best for the job; i think you mentioned confidence, to that I agree.