Print out a hard copy of the draft of your essay and number each paragraph. On a separate sheet of paper write a list: 1, 2, 3 etc., leaving a space between each one. Then write down next to each number what that paragraph is about, in one word or phrase if possible. Let your eye drift down the list. Did you intend, in paragraph 19, to return to the topic of paragraph 11? Did you aim to spend paragraphs 20–25 on one aspect of your argument, but only one paragraph on another aspect? If so, fine. If not, you can rearrange your paragraphs to improve the structure and flow of your essay.
22 February 2017