Someone mentioned quotes before...thats what i actually went with. I learnt heaps and heaps of quotes (just because i find that fairly natural, and they make sense - plus leeway is given if u don't get them verbatim)...EAch quote had a point associated with it by nature of it being relevant
e.g AOS: "even if nothing is there at least there'll be a draught" - can illsutrate that even the action of change is positive. That way when i remember the quotes, i remember the points and along comes an essay....
I know a lot of ppl who used memorised essays. It was 50/50 though, sometimes it served them well, sometimes less so. My method may not guarantee you 19/20, but it may offer a consistent 18/20 etc....Also, teachers can tell memorised essays, and often ppl forget to shape them to the question. However, this year there weren't any actual questions per se, so some ppl were pretty lucky in being able to regurgitate their stuff...may not always be the case.
Bottom line: find something that works for you - you have 3 terms to practice and perfect it in many an assessment task/exam.