HSC isn't as scary as it's made to be guys, seriously I know what you're going through, the stress levels and stuff, but just take it easy a little, dont stress hard out, it wont help you, study, and also take "some" time off, as in do stuff you like for a few hours a day, if that's sleeping...
I did well at history/geography/ decent with english and I hated it, this was before year 10 tho, and hsc english... did ok, but many people do it, most for scaling
I did that for all my essays, all I did was change a sentence or two, maybe in the start of the paragraph, add something in the middle, and re-reference it to the question at the end, depends really, whatever you're used to stick to it, best way.
My school had a variation, the humanities were all excellent, English was spread out from excellent to shit, math was the same, science was similar, except physics was just shit.