First of all I would like to say , be honest.
When you inter in interview room your confidence level is very important. You should be face board members with confidence. Definitely your knowledge is also matter. But without confidence nothings.
Second thing is your attitude, How to think on any situation. You should be always positive attitude in any situation.
And another thing we all know sense of humour, dressing is also matter here.
Your bio- data complete in best way. Because many
questions arise your bio- data.
And last but not least interviewer more knowledgeable than you so don’t be smart.