I also do 3 unit and you should know that most 3-unit students only got in between 55-75% so it was a very difficult test.
I got 67% and almost the same mark for 3-unit.
The HSC will be much easier.
I use a variety of textbooks and find that CONQUERING CHEMISTRY is best for revision and for writing notes while CHEMISTRY CONTEXTS 2 is best in explaining the more difficult ideas in chemistry. The only thing EXCEL is good for is tiolet paper.
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First of all you can not expect to get any great results, however in chemistry you can always get a pass if you just learn the basics. DON'T go into detail if you havent got a good hold on the basics.