Schools often hear about how Australian schools are ranked internationally and contrary to popular belief they are not ranked on NAPLAN data.
The OECD’s Programme for International Student Assessment (PISA) evaluates education systems worldwide by testing at random students with their own tests.
If you are interested in looking at some of those tests, the 15 year old maths and problem solving tests are available online.
http://www.oecd.org/pisa/test/
The advice is to use Firefox
For those of you who want to dig deeper PISA-2012-results-volume-V