I arrive only at Brisbane Domestic at 08:05am and the test day starts at 08:30
Utter madness. ERSA quotes 10min delays for aircraft arriving at 0805. I am guessing you are on JQ929 ex Cairns. Actual landing time today :- 0822 yesterday :- 0814 (on a Sunday). You need to come down the night before and get a good sleep and not be rushed if you want to give this your best shot.