For those of you worrying about this exam, don't
You should not get your hopes up for band 6s in this subject, last year i managed 7th in the state in this and yet only received a mark of 92 (not many 6s are given out).
There is no set way to study for this subject (unlike many others), my advice is to look at how to write reports and memos (as someone has mentioned). Extended responses is where you should focus, MCs and short answers are general knowledge and anyone with even a general understanding of the course should breeze through these with no problems. Think about throwing plenty of IT terms (study these!) into the responses and keep it complex, but at the same time understandable.
You are best to invest your time into other subjects, IT is not worth the time if you are taking away from your maths or english, as the marks are so limited.
Practice past papers, study hard for english and you will be fine in IT. Good luck to all of you