Can you use sonnets to audition for drama schools?

No. I've been there and done it...I auditioned 2 years running before gaining places at R.A.D.A. and The Drama Centre.....don't use a sonnet....choose a speech.....some publish a list that you have to choose from whilst others leave it up to you but believe me a sonnet would not go down well....I''ve sat in on many audition panels at colleges since I completed my training.