but like i just covered some topics in the textbook we work on at school (Cambridge), and scrolled ATAR notes to find some topics that might be in there for maths. My parents also bought the edutest practice papers, so I did those and reviewed the questions I got wrong. After I looked at the quesitons that I was consistently getting wrong or struggling with and I'd cover those topics.
But mainly tbh I feel like my preparation for selective in year 6 came in hand for the rest of the tests