I personally bought a notebook from Officeworks with those grid lines in it (so I could draw graphs nicely haha), and did half a page to a page for the important exercises we covered over the year. I had key points from the exercise, and worked examples of questions, which I found really useful to refer back to
Also stuck in past SACs, the sample exam (as it was the first year of the SD), and questions that my teacher said we important to know how to do, plus stuff that I really struggled with
I'm personally a big fan of handwriting - actually writing the stuff out is revision in the first place, and I reckon I found it easier to follow my quick dot points because I knew my handwriting so well, if that makes sense. Like, sometimes I find it really hard to follow and absorb stuff that's been typed up, so I didn't want to risk that happening in the exams!
To be honest, I think there's no single right way to do it. Just do something that works for you, will work to your strengths, and help your weaknesses. I know I started feeling a lot better about my bound book when I stopped caring about what other people were doing.
All the best!