I don't think you need to. Yes, Legal Studies is a subject where you have to memorise a lot of information. But, I would strongly caution against just memorising slabs of information from the textbook. To be brutally honest, it won't get you anywhere. That's why VCAA have changed the study design from this year and onwards, so that students don’t just regurgitate slabs of information to a question when it’s not required. It’s more-so applying the information you’ve learnt to the question. It’s not as easy as some people make the subject to be. If you’re willing to work hard and put in the consistent effort, then there is no reason why you shouldn’t do well. In my opinion, if anything, just do some light reading from your textbook in the holidays - to get a feel for the subject.