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Yes it's called an annualised rate. You take a lower rate, usually lower by about 2-3 dollars and you will be paid over the school holidays. I work in a sessional kindergarten (Vic) and that's how it works for me.
Permanent or fixed term teachers get paid over holidays, well they do in Tasmania anyway and they are made permanent after a certain amount of time working for the department. What state are you in? Maybe consider moving to a state whos education department has a better pay structure.
If they are permanent they get paid every week, if only casual its just the hours worked.