I look back and don't remember the studying. Either I blocked it out or I didn't do too much. I just did whatever I felt like, whenever I felt like. Timetables didn't work for me.
Biology I really wanted to do well, so I read ahead in the textbook and wrote dotpoints every day or so. Probably did the most revision for bio.
English I did too little, too late. Our class was advised to do practise essays regularly all through the year and of course, none of us did. Come stuvac, we were cramming, writing 3 essays a day to be marked... not good. If I can offer one piece of advice, do 1-2 essays a week from the very start, get them marked and build on it until you can do your 3 modules ones in 2hrs and do damn well. Seriously, it will help so much. Essentially, you're always writing about the same thing in English, so think how well you'll know your shit if you do that!
General maths OK, I did practically no work for this course, just a couple of practise papers before the exams, because I was making stupid mistakes. But I won't pretend to regret not doing 2u - it like having the workload of 10 units but still having a safety net.
Modern history OK, you do a history subject, there is a fuckload of stuff to learn. And not just learn, but analyse... you can write practise essays, but there is just so much that they could ask you, unlike English. Really make sure you know your facts, figures, dates, terminology, key figures - start really studying and learning as early in the year as possible, because there's too much to cram for.
Geography I wrote some good notes for my subjects and learned the essay content very well, but I overlooked skills and that was a big mistake. Sure, they're not extremely difficult, but it's easy to get arrogant or overwhelmed by them when you open that exam paper. You could still lose enough marks in the multiple choice to miss a band 6. So do lots of skills practise.
German cont Again, I didn't do too much work here, probably because I'd absorbed a lot of German into my life - reading HP, watching tv and listening to music. So I just did the send-away work (OHS), which counted as classwork and exam practise. Nifty, eh? You can't cram so much for languages - I'd say have a decent vocab but really know your grammar. Because you can always look up a word in the dictionary, but if you don't know how to use it, it's no good.
Yeah... looking back, I maybe did an hour or so a day. I usually did assignments a day or two before, which I do regret, as do I wish I studied consistently through the year for trials and the HSC. Cramming isn't as effective as knowing and understanding all your work. But I still got lucky and I'm happy with how things turned out.
Good luck c/o 2006! Study consistently but don't feel the need to do a time limit - get a few tasks done and then go enjoy yourselves.