Yuanze's advice is really good, in addition to memorising key concepts and some quotes to twist your ideas a bit. Listen, even if you miss the nail by a few milimetres, you can still get 80% [or maybe its my luck].
Try to take the key concepts of the module, and make some essay questions. Ask seniors what they got, ask teachers for some sample essay questions. Practicing a variety of questions will help on twisting and bending essays a bit but will also help you deeply understand quotes enough to bend it for the question you receive (I've got 87% on one of my finals doing this). Even if you BS it, make it a smart BS, with concise wording and a hard-to-argue points. But don't ever just throw in big words or mashup your grammar if you're going to risk it.
[This isn't really aimed at OP but anyone I guess]
