I reckon watching the play would help me see the whole 'picture' of the story more clearly.
That said, I didn't see it live, so I relied heavily on my Shoe-Horn Sonata study guide book to fill me in. If you haven't already, borrow a copy from the library. It helps. It's been designed to help you in each area required of you in the HSC. Of course, you can always improve your understanding of the text and the module by asking your teachers and friends questions about it.