I didnt use these for the HSC, but I used them for one of my trial exams. It actually is pretty easy if you are smart about it. Anyway I dont think you should cheat, I only did it because I was very desperate at the time... no excuse I shouldnt have done it etc... BUT NOW I'LL LET YOU ALL IN ON THE PATH TO CHEATING SUCCESS!!!!
High success, low risk methods of cheating:
1. Write notes on hand. Wash hand so that ink is faded and cannot be seen from a distance but still able to be read up close. Pretend to be stretching hands to get a good look at your notes without arousing suspicion.
2. Get some good summary notes and fold them up and put them in your wallet/back pocket. Go to the toilet when you are going to answer the question. Have a quick read of the notes, but dont take too long.
3. Write on the inside of a hanky. Pretend to have a runny nose all through the exam, sniffing occasionaly. Get out hanky to "blow nose". You can only have a quick glance so this is best for things like dates / time lines / math formulas.. short stuff. This method has the highest risk factor, must make sure no examiner can see the side of the hanky facing you.
4. Write 2 or 3 dates on your eraser. Smudge them so it looks like standard pencil smudging from rubbing out.