Day of Interview:
A.Be presentable and smart.Dress up professionally well with proper shoes and smile and confidence on your face.Be calm,confident and slow down your speech (both speed and volume).Coffee,chocolates ,good breakfast,Caffeine are your good friends,don't forget them.
B.Get a file folder prepared with your CV,Degrees,certificates
These are not seen,however no harm taking them with you.
These are the basics.These are the things that will differentiate you from others.Everyone appearing for these posts have ample clinical experience and academic success as well.Its your personality which is going to determine how you market your skills.So pay attention to these.Don't fuff around.If you don't know the answer ,be humble enough to say:I am sorry,I don't know.Listen to what's being asked carefully.