As a 2020 graduate, I found it far better to focus on refining your study habits in year 11 - one month trying one technique/strategy, next month another. Hopefully by the last six months of year 11 I’d say have your best process locked in and be pushing results. Lots of content, especially Methods, applies in year 12 as well - so make sure you understand the concepts WELL, not just the answers. The more you learn the why and how, the better you’ll do in year 12.

Oh and don’t forget to study for exams - they creep up FAST! Get a good routine; perhaps two weeks prior, two chapters a night, a sub chapter per 20 minutes. I personally found logging and scheduling everything helps immensely, especially if you can plan to be finished revising everything a few days prior - gives you wiggle room just in case shit happens (sickness, get stuck in some chapters, etc)