Hi! I was kinda in a similar situation in that I didn’t like some of my year 11 subjects and picked up Business in year 12. I don’t want to say it’s easy, but it’s definitely not the hardest of subjects. As long as you pay attention and put in a good amount of effort you can achieve a good score. I don’t think a lot of content carries over from units 1/2 anyway. It is very content-heavy, though so you’ll need to memorise a lot throughout the year. I ended up getting a 37 (34 scaled) on good scores. I didn’t put too much effort because I knew it would be my worst subject and therefore hardly affect my atar, but my point is that if you put in a good amount of effort, you can get a really high score. A lot of it is just common sense and understanding though. If you want something to do during the holidays, I would try to find the textbook and go over the first few chapters to familiarise yourself.
I didn’t do year 11 legal in the current study design, so I don’t know how much carries over, but I can tell you that year 12 legal requires a LOT of memorising, understanding and applying. What I did was just look over the study design frequently and after you cover a topic in class, and make sure you know how to do the key knowledge and skill that you just learned. Also doing this before sacs is very useful as well. I found practise sacs to also be good. You really can just make up a question yourself to test yourself, and if you’re not sure then peek at the textbook then answer it again without the textbook. If you want a high ss, your sac marks do need to be really high, as well as your exam mark. Good luck!