While the process of interviewing depends largely on the independent approach of the interviewer, there are few things that would make an immediate impact in case if you were to follow the same.
Here are some handy tips on how you could make the interviewer think about giving you an upper edge over the others :
You need to make a conscious effort to smile when you enter the room and greet the person or people sitting in the room.
If possible try and get an understanding of how many people are there in the room.
This will help