Practice your writing skills
There are many ways to prepare for the ACT Writing Test. You may be surprised that these include reading newspapers and magazines, listening to news analyses on television or radio, and participating in discussions and debates about issues and problems. These activities help you become more familiar with current issues, with different perspectives on those issues, and with strategies that skilled writers and speakers use to present their points of view.
Of course, one of the best ways to prepare for the ACT Writing Test is to practice writing. Practice writing different kinds of texts, for different purposes, with different audiences in mind. The writing you do in your English classes will help you. So will practice in writing essays, stories, poems, plays, editorials, reports, letters to the editor, a personal journal, or other kinds of writing that you do on your own. Because the ACT Writing Test asks you to explain your perspective on an issue in a convincing way, writing opportunities like editorials or letters to the editor of a newspaper are especially helpful. Practicing a variety of different kinds of writing will help make you a versatile writer able to adjust to different writing assignments.
It's also a good idea to get some practice writing within a time limit. This will help build skills that are important in college-level learning and in the world of work.