plah...i never really bothered to study for the yr 10 SC. when you get to yr 11, you'll realise how pointless it really was. but, i suppose, you should still try to do good because parents compare to other ppl's kids...so annoying
anyways, my suggestion is to read through what you have in your exercise books [because the teacher has to teach you everything you need to know], then just make a note of the stuff you're not too confident about. also, it's a good idea to do some practise questions.
anyways, good luck with whatever test you have to do next. =)