I used to memorise my essays 2 days before the paper 1 and paper 2 exam. (yes i know, it may sound too late to do so, but i'm sure everyone else would have done the same). I would highlight the main ideas in each of the paragraph so i would get an idea of what I would mainly talk about the essay in the exam. Next I would briefly memorise the introduction and move onto the second paragraph and memorise bits by bits. I would also cover up what I had tried to memorise and write on the piece of paper to see if I had written what I wrote in the essay. If I didn't memorise everything, I would continue to write it until I got it! This was a very long process but I must say I do get lazy when I try to memorise the last essay (especially paper 2). So instead i just memorise the quotes and a brief explanations of them.
If you can't be bothered memorising your essay fully, I suggest memorising quotes and the explanations instead because you tend to blank out in the exam. But as long as you remember the quotes, you should be fine
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Just elaborate on your point more!
I hope this helps!