The site above and the RNZAF website (
RNZAF - Step Up Aircrew and Officers) are the two that I found to be the most helpful for specialist testing. The RNZAF site offers some questions that are worded exactly the same as the ones you may find on some of the tests you do, the difference being the numbers used. Know how to do the questions on the RNZAF website and you'll be fine with that part of the testing. While you're driving around or just walking around the streets, do some times tables in your head as well to ensure your mental arithmetic is up to speed.