Demand more money for Australia Public Schools!

I’m not saying that Australia has the worst situation - of course not! We are extremely lucky to have what we have. But private schools that already get funds from students get more then public schools, free for all students.
The local high school in my area is a medium sized building, barely fitting the over 900 students they educate. Or try to at least. Most of the classes are filled with at least 30 children, but there are only books, atlases and textbooks for 15-25 students. All students deserve an equal education and these resources and funds do not give them full opportunity!!