Work on your diction! Whenever I did auditions or exams in the past, the thing that mainly let me down was my projection and diction. Remember that projection is different to shouting(!) but try to make sure your voice carries well. Try to stop any nasty bits of dialect like dropping H's or not finishing words properly, if you do that in your everyday speech (it's worth recording yourself speaking and listening back to pick up any little quirks you may have and not noticed). Make sure that your speech is clear and coherent, although you don't have to drop your accent or affect a posh one to do this. Oh, and if you have trouble commiting the monologue to memory, record yourself reading it and listen to it whenever you have the opportunity!

And let us know how it goes ^_^

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