Like I said earlier, I worked at Kumon for several years and we had kids doing VCE stuff (M) in lower secondary school.
tbqh, we could probably have coached students even lower to be able to get the questions right. At the end of the day, a math exam is just pattern recognition and being able to apply the right formula. We had kids learn how to factorize and then do a few hundred factorization questions. And then repeat. It's rote learning but it sets you up extremely well for future education.
Since I'm not working for them any more I can use words like "guarantee" without worrying about actually having to refund money so; if you do Kumon for at least a year in middle primary school then I guarantee you'll be ahead of your maths class in VCE. There's no special trick to it and it's not even that enjoyable or engaging but it improves your skills very effectively.
will answer questions if you want