So I just did the HSC this year and did surprisingly well, getting a 95 in advanced which I could never have imagined. As a guinea pig of the new syllabus, I can say that you can and probably should memorise/pre-prepare an essay for the actual HSC, but just be prepared to be flexible and creative in changing it to fit around the question.
I would highly recommend him as a tutor because you can tell that he enjoys the subject (who else would read Great Expectations for fun in like primary school) and it really shows in the way he teaches, how clearly and eloquently he communicates his ideas which made English lessons a little more interesting and less the bane of my existence. In particular, I really appreciated the way he would logically work through an argument, laying out the bare bones of the paragraph like 'you need a quote to show A, which leads onto B to finally show C etc.' This made the logical progression of the argument very clear and so instead of being confusing or repeating myself, it allowed me to write an argument that built up on an idea and kept moving.
However, I gotta say that sometimes he's a little flaky. I remember in the few days before my first HSC assessment I had made some edits to an essay and asked him to look over it and he said he would. But he ended up sending me his feedback in the period before the exam and I had to basically rush to memorise his suggestions/changes. At other times, he would ask to change the lesson with very little notice like an hour before we had planned, which can be a little frustrating.
But overall, 10/10 would do again