1) Do prepare for an interview regularly even if Your interview is not scheduled. 2) Keep master file of questions you were asked in your past interviews and you were not able to answer. 3) Have a confidence in your speech, in your word and in your appearance. 4) Keep yourself updated for current affairs and last 5) If you do not know answer, feel free to confess it. Do not try random answers. Interviewer are much smarter.