No matter what subjects you do, your teacher should have given you an outline of your syllabus, as well as frameworks for what the different verbs (describe, discuss, evaluate, etc) mean in terms of answer structures.
You should make summaries of what you learn in class in terms of those dot points. Do this on the computer so that you can keep updating it, and add to it at the end of each week.
If you can find the time, go over the summaries with your classmates. Don't forget that your HSC marks are scaled along with those of the other candidates from your school, so you should be cooperating with your classmates. Also, explaining things to other people is a good way to learn.
On top of that, just do a few questions from past papers each week.
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