Hi Aarna,
For face to face interview, i would suggest you to maintain eye contact, sit comfortable liitle bit leaning towards the interviewer, and alawys speak the truth. even if you lie to the interviewer your face will or the eyes will always mention that .
Dont look up towards the ceiling when you dont know the answer or if you are thiniking about an answer.
Hope this will help you
Thanks
Regards
yousuf