Start brainstorming quickly within one minute i.e. all your ideas for the essay question. Then allocate the answers into your structure of introduction - 2-3 main body paragraphs - conclusion. Throughout the essay, keep your answers succint and make sure your sentences are not overly long. In every main body paragraph, follow the PEE rule - point, example and explain. Make sure your opening sentence flags the reader clearly as to what this paragraph is about. Also try to end the paragraph with a nice closing sentence. The introduction and conclusion should be quite similar, make sure you are not introducing new concepts in the conclusion. A good introduction would roughly go through the points and arguments that you would make, and the conclusion would wrap up those points made in the introduction.