Which spec are you on?
Make sure you write out a plan of how to answer each question in the written exam, and time yourself so you have the technique nailed. It’s easy to spend an hour on the live evaluation alone.
Clean up acting skills and make sure you are communicating with your teacher and group! Turn up to rehearsals for gods sake!
And most importantly, enjoy it. It’s a simple enough subject and you it should be relaxing and creative.