Hey!
I think the first thing to know is that there is no one way of studying effectively. Different people study better doing different things, even changing depending on the time of day! I know I certainly did, despite there not being a great deal of variation.
Method
1. I wanted to handwrite my initial notes for all my subjects in Year 12, as I had done beforehand, but I quickly realised this wasn't feasible so I only ended up continuing that habit with Legal.
2. Revise content, flicking through notes, ensuring colour coding was accurate (used a BIC pen).
3. Type my notes (put this step before (2) for all subjects bar Legal & BusMan).
4. Make Kahoots & Quizlets, go through them.
5. Complete practice SACs and Questions.
6. Get them checked by somebody (eg. friend, teacher, tutor).
7. Any difficult concepts/ones that you didn't score highly on, immediately go back to your notes and reread over those, then practice the questions again.
Why?
I am not, and have never been a quick writer. Doing writing intensive study as I had been doing previously was causing me to fall behind after about two weeks this year, so I made the pragmatic decision to change it up. Study wise, I couldn't have imagined doing things any other way this year, as I wasn't an amazingly creative/visual person, so diagrams, pictures or other things weren't super effective. I did like making the Kahoots & Quizlets for my classmates and I, though!
I think an underrated resource is collaborating with peers, talking about theory over lunch, discussing things in class, making connections that way in a (somewhat) intangible manner. I know some teachers frown on it, in class especially, but I honestly found those interactions as one of the most effective methods, and it really featured in between all 7 of those steps I listed above.