Should I aim to cover both units over the holidays?
Should I base my notes on exam paper?
What should I do to prepare for SACs?
How should I prepare for analysis task based SACs (for example data interpretation and analysis questions for enzymes or immunity)?
1) No, I can assure you that you won’t even have the time to go through the entire course (and if you do, then you probably haven’t learnt U3 properly). Just go through AoS1 of U3, which will cover your basis in term 1. That way, you can focus on questions in term 1 instead of doing notes, and then each holiday you continue to do notes for the subsequent Area of Studies.
2) Base your notes on your textbook and other resources, worry about exam papers later in the year. You can refine your expression throughout the year when you encounter practise questions, and make notes of these later. For now, just make sure you know the content.
3) Do practise questions! I recommend things like checkpoints, but I know there are other resources which you can get questions from (for instance, Atar Notes offer a similar resource, but I haven’t seen/used this so I’m not sure what it’s like).
4) Worry about SACs in the year; your teachers will explain it. For now, just ensure you know the content for AoS1 for U3.
Apart from that - ENJOY YOUR BREAK! The last thing you want to do is burn out, so make sure you keep the study to a minimum, because it’s super important to rest up before the new year begins!
Hope this helps