Develop your own unique style for writing. This is key in any successful English student. Now is the best time for you to do that as you have the freedom of experimenting with your writing, without constantly having the "score" on your back.
Reading articles in the newspaper, particularly opinion pieces, might the first step towards developing your style, as previously suggested. After that, it's all up to you. That's what makes such a discovery fun.
I must say that throughout this year I've done so, and failed in many instances. It is only now that I begin to notice how mistakes have helped form the basis to what I write.
Remember that ultimately your style of writing is what will set you apart from everyone else in VCE and even later in life. It's not something you can ROTE learn or get a tutor to force upon yourself. I urge you to step up to it; it's something this generation needs to develop and cherish.