Writing essays should show your skills and knowledge on the exam. So it is highly recommended to pay great attention to its writing. And if you know you are not that kind of a person who can deal with that on his own, better ask specialists for some help. I've personally used to contact Supreme essay. Those guys helped me a lot with all kinds of written assignments.
on top of these great comments I suggest you don't fall in the trap of just writing your pre-prepared essay. Definitely practice molding your essay to fit many questions.
I'd go about memorising an essay first then trying to use your essay to answer new essay questions on the same topic.