In reply to bouldery bits:
I did a teacher exchange in 2000 going to teach in a state secondary school in one of the prosperous northern suburbs of Melbourne for a year. Even then it was like stepping back in time, a bit of an eye opener and definitely challenging.
About a third of the kids in Australia go to independent/private schools, the state schools pick up the rest. The staff at my school were all very pleasant but the attitude was very much “You’re on your own mate, get on with it”.
One of the first lessons I had was with an A-level equivalent IT group where some of the students came in and promptly started to climb all over the furniture while others banged their heads against the computer screens. WTF!
It took a while to get the hang of things but I was certainly shell-shocked at the end of some weeks. The long drive out to Arapiles, or the Grampians, on a Friday evening helped to reduce the stress levels and the weekends made things seem worthwhile though.
Things might have changed since then and primary schools might be different. Loved the lifestyle and my advice would be to go for it and make the best of it.