And there is a app for that ;-) You can use http://www.findschoolzones.com.au - a mobile friendly app/website which puts school zone/catchment information at your finger tip.
The app shows and sorts state schools based on latest NAPLAN results which as you would already know should not be used in isolation but can be good guide to start with. It provides the basic info on the school (website, phone, address etc) and links to the properties for sale and rent (uses realestate.com.au) around that school catchment area. Also if you enter a home address, the app can help you find all the schools which are zoned for that address along with latest NAPLAN results and school route using google maps.
Hope this helps.