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Discipline is the key, manage and plan your studies so you can enjoy your last year of school. Have a particular goal helps, and assess how much work you need to do accordingly. You don't need to study all day, and having books as your only memory of year 12 isnt good. Don't Stress and Have Fun
specifically,
phys/chem: get as many textbooks and resources as you can, dont rely on your teacher, learn all the stuff yourself....ahead of the class if possible by making notes(not just a summary, but extended notes) on each dot point. use your teacher for specific queries.
Maths: do not fall behind(learned the hard way haha). Do exercises consistently... try to link all topics together ... never let something youve learnt earlier slip from your memory, challenge yourself...try and learn methods of approaching certain problems so you dont have to "work each 1 out".
Generally, you should have finished everything by yourself by your trials..... do your past trials(esp. your own schools) before your trials. Don't use your actual trial to test techniques for the hsc. Do past trials under exam conditions to test different approaches whatever...afterwards practice various past trials and HSC papers regularly. When the HSC comes, you should b well versed in the sort of q u should expect...and just dust up the various obscure knowledge things(eg those cram dot pts in science)