Mmmm, my BIL is an accountant. We didn't get much at all last year and DS1 was in school the whole year. There are alot of things you can't claim such as School Fees, Uniforms. I would have a good look at the ATO site at what is eligible to claim.
We missed out on claiming our computer as we purchased it 2wks before school started (he was in prep last year).