Write your own notes
This is nothing you haven't heard before but writing your own notes is a must! Using other people's notes may help you verify or get a better understanding of the topic but at the end of the day, you will really master the subject by writing them yourself. When you write your notes, you are able to properly consolidate your learning. Also by writing the notes in your own words, you will really develop your knowledge and will get a feel of how to explain certain terms or concepts when asked in a SAC or exam question.
Titles
I really like putting titles on the top of each page or section of my notes. I will put in the title of the unit, area of study, and the topic name. For example, my first notes from VCE Legal Studies had the title "Unit 1, AOS1: Principles of Justice". At the end of the year, when you're prepping for your exams, you will realise you have forgotten what certain terms meant or a particular area of study. By clearly labeling each page of your notes with a heading, you will be able to find your notes quicker if you are looking for a particular topic. This is really something so simple but will save you so much time in the long run.