Dora asked me for an explanation of our education system here in Australia. I can only speak for our state.
There is kindergarten to begin with at the age of three or four. This is almost like child care or creche. I don't think parents have to pay have to pay for kindergarten but probably they do for creche.
Proper education begins at the age of five with Prep Year. At six they will start level one and continue on until level six, where they will change to a secondary school or college at the age of twelve and continue their education for another six years to level twelve. There will be final exams for them in year twelve and depending on their results, may or may not get a good score to enter university.
But within this they could attend a normal free state education for their whole education, or a private non religious or very religious school. My niece Jo is not unusual in that her early schooling was at a good state primary school but because she is pretty smart, her parents thought it would benefit her to attend a non religious private school. Of course she has barely been at school this year because of closures and she learns at home. She doesn't mind learning at home but does miss the social interaction at school.
Further, it they do well with entrance exams, they could enter Melbourne Boys High or MacRobertson's Girls' High, respectively for boys and girls and schools for the gifted but funded by the state.
Then there are a couple of government funded and private alternative secondary schools for the artistic and perhaps those who just don't fit into the normal education system.
Teacher's Aids are provided for those students with disabilities but I am not sure that works terribly well.