In South Australian Primary schools/secondary you pay for "materials and services" so photocopying, pens/pencils/coloured pencils, rulers, individual whiteboards, scissors, text books, writing books, access to ipads/pcs etc.
The school can set their costs, and it used to have to be under $300 per year. I pay $260.00 per child this year. It rises by $5 each year.
For secondary school next year, I will pay $400.00. Plus she has to have a laptop, so in all, approx. $1000. I also have to buy her "book list" which is pens/pencils/calculator, maths sets, writing books, lecture books, USB sticks, scissors, ruler etc.
Families on low income can qualify for a school card, which means the charge is wavered.
It's usually paid over the first couple of terms, but you can ask for a payment plan, so it can be spread out over the year.
This is additional to costs for excursions etc.
The schools are also allowed to take you to the debt collector to recover costs if you don't pay.
Most people manage, because you have to if you want your child to be educated.