I did basically every question from project maths in relation to the topics we studied (past hsc questions by topic), and three textbooks alongside the 2 or 3 past papers I had my hands on, I suppose going over questions I get wrong for stupid reasons is something I may not do enough of as it...
I'm currently in Year 11 undertaking Ext 1 and Advanced Maths and I know the content quite well and have put quite a bit of study into it. I completed most relevant questions from Fitzpatrick, Cambridge & MiF alongside some from Proj Math and was getting around 90-95% on my practice papers...