When practicing for independent writing, come up with a list of familiar topics and write essays about them. Practice timing your activities so that you take thirty minutes to plan, write and revise each essay. Prewriting entails thinking about and listing all ideas related to a task before writing. Pick out one main idea and create a list of the major points you would use to support it. Then you are ready to develop an essay using appropriate explanations and details. Once you have the essay written, reread it to ensure all the points you have written are relevant to the main idea, developed in detail and grammatically correct.