Eat healthy food a few hours before (something that will give you energy but won’t leave you feeling super full),
SMILE! (unless it’s not a smile dance- if not keep your face strong not like you’re day dreaming)
Act like you know the dance backwards and forwards, even if you don’t.
Practice free styling! A lot of auditions start or end in freestyle. You don’t want to have to make it all up on spot and not know what you’re doing
Know what moves you look good doing (If you don’t have nice kicks don’t do them in your freestyle)
This is hard to explain but make yourself seem open, make the judges/auditioners/what ever you wanna call them, want to know you and know more about you.