it's a BYOD device.
originally the school said an iPad3 would suffice.
idiots
need an iPad 5. i.e. something to run iOS 11.
the ipads from amaysim on ebay have an expected delivery date of 4 weeks
thank you
EDIT - ending up buying a shop return with pick5 for $350.55 delivered
thanks for helpful comments
iPad 5 = iPad Air (2013)
Suggest getting the 2017 iPad.
https://www.ozbargain.com.au/node/354773