I find conquering chemistry to be horribly confusing.
Contexts is the way to go. Don't ever buy Surfing unless you're really desperate, though, because it's just way too error-riddled and covered in a thick crust of inaccuracy.
I like the success one books for study. they have all the HSC's from 2001 - 2006 plus detailed answers. There's also specific module chapters at the beginning.