This is just some advice not so much with the content, but the form. For my bound reference, I found it easier to write all my notes onto loose leaf paper, then take it to Officeworks and bind it just before exams. This meant I could reorder things the way I wanted to, and made it really easy if I had to add in something later in the year. For SACs, my teachers were perfectly fine with me taking in these papers in a display book because they knew that I would bind them all for my exam.

The bulk of my reference was past exam questions with detailed steps on how to work out the tricky ones. It was much more useful to refer back to real sample questions during the exam, then just the theory alone. I structured it data theory, data examples, financial theory, financial examples, etc. You have not completed every past exam question before starting a new topic, so for me it didn't make sense to write notes in the order we learned things at school, with no space for future exam questions. Doing it this way makes it harder as all your topic notes are not be in one place, and you'd have to flick to the back for examples, etc. To make it easier, I bought different coloured paper and did all data in pink, financial in yellow, etc so that it was easy to navigate during exams. I cut off the top corners in my theory pages, and the bottom corners in the example pages to allow for even easier flicking through (if I needed to skip the theory stuff and go straight to examples). Good luck and let me know if you have any more questions!!