I disagree with the rote learning for Chem.
Try to understand as many things as you can, trust me the content can be overwhelming if you try and memorise everything. The inevitable stuff on society, environmental impacts etc. defs requires rote learning, but please don't rote learn concepts such as equilibrium, proton donors, galvanic cells and so on. The rote learning is obviously necessary for things like the scents of esters etc. but those parts aren't major parts of the syllabus.
Recently, HSC Chem has had a tendency to combine concepts that are overlapping, and a holistic understanding of the course (i.e understanding concepts and knowing what's exactly going on) does help in deciphering those types of questions and obtaining the most marks in those.
Besides that, know all your verbs in detail from the BOS website, know what safety/reliability/accuracy/validity are for pracs, know things like including the equipment as part of the method when outlining pracs, using direct action verbs when writing out the method of a prac, line/curve of best fit, calculations and significant figures, drawing labelled diagrams with rulers, drawing flowcharts and other skills from 9.1 in the syllabus.
Add equations wherever possible IF relevant - it's Chemistry, you need balanced equations with correct states to support your answers.
Don't spam too much unnecessary information within your answers since there's no half marks and if you say 1 wrong thing despite 10 right things, you still lose the mark. So just be cautious of that.
Then just practice lots of past paper questions and get to a point where your answers become extremely concise and you're getting full marks according to the marking criteria in the least amount of written lines.
I think that should be it.