Hey, i came 1st in the state in PDHPE in the 2007 HSC.
My advice is to think laterally and have some really really good preperation material.
Know your syllabus but go beyond the syllabus to achieve really high marks. Think of some great examples from your sporting experience and integrate them into your responses. Knowing what to study and which areas of the syllabus to strategically focus on is very important.
My boyfriend got 98 (2nd in the state) in 2006 and he knew the syllabus back the front and upside down and practiced past exam papers.
Although it is more then just that, you need to know why and how to adapt the information along with some excellent examples.
I must say PDH is fukn gay, i regret picking it ! And every time i put a mark into that fukn sam thing my PDH mark gets scaled the fuk down, even when i put 100% it pulled it down to like 70, like what a fuken joke !!!!!