Who is your examiner and what songs are you playing? You must appeal to the examiner straight away with your technical work. AMEB examiners love testing that shit and place emphasis on it, assuming that List A- a technical baroque piece (try not to play too fast and keep at a reasonable tempo)
List B- A sonata movt (same as list A)
List C- Romantic (I highly recommend use plenty of rubato and expression particularly for Chopin)
List D- Contemporary (there are many interpretations, play with your own sense of style)
Examiners will be impressed if you can memorise your pieces
Don't freak out if you make a mistake or screw up a section, just continue playing until the end (this includes sight reading). Practise singing la la la for pitch as this may help for aural (clapping/humming is not advisable), for gen knowledge, just regurgitate all info you know about the piece, the composer and his life. Do all this and with luck the examiner has a wet dream over your playing, you should get an A. I did....
although I barely passed AmusA after 2 times