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Agreeing with these guys, definitely practice makes perfect for maths. There's pasthsc.com.au for past paper solutions (and obviously the official boardofstudies website), as well as this website for trial papers.

On @emilios's point, the quickest way to solve this is to use the fact that cos(x) and sin(x) are related to each other by shifting cos(x) to the right by 90 deg, i.e. cos(90-theta) = cos(theta-90) = sin(theta). And for the denominator, sin(90-theta) = cos(theta). But this is stuff that you...

There are a lot of tuition centres around, including Hurstville. At this stage though, you might be better off with HSC programs in the first week of the holidays.

Private coaching really can't be beaten, since the focus is only on you & your opportunities to improve - and it can be done at your own pace. But different subjects work differently with coaching. For English or Law, you might only need a particular number of lessons to get you at the right...