I think Phuket is a much better option than the Gold Coast, but like anywhere if you choose the be silly and get into trouble, you will. My advice to any schoolies going is stick together when you go out, and maybe take it in turns of smeone staying more responsible each night if you get my drift.
My only advice would be no Full Moon Partys for schoolies, way too full on, worsr by far than Gold Coast as there is no law to look out for you.
Have fun
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Imagination Is more important than knowledge......Albert Einstein