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
Just elaborate on your point more!
I hope this helps!