It is nice to read that someone is keen on getting on the work early!
In all honesty, if you actually have an interest in the coursework then go through and work ahead, last year for Unit 2 Chemistry I did three-quaters of the Unit 2 coursework in my two week break because I was just that excited about acids and bases. I went on and did a lot of other things myself, for example, I read literary critiques and few theses on my favourite text this year. Working ahead is not a detriment if you genuinely want to learn and place yourself in perhaps, an advantageous position. If you know that you love to learn and think the coursework is interesting, I would recommend printing out the study designs for your subjects from the VCAA website, read and take notes from your textbook (if you have it yet, otherwise just watch Youtube videos and learn), then complete practice questions. However, I stress this point, if you are going to do so, do not got Super Sayian 4 Gogeta crazy and complete everything in a term, I only say this because to really allow yourself to take all the knowledge in and have a thorough grasp with an amazing lead, it is important that you find a balance between a healthy lifestyle, a social life and studying.