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If working as a cosmetician interests you, there are a number of classes you can take in high school to prepare for this job. Some vocational high schools offer classes that will prepare you specifically for cosmetology careers. If you are not attending a vocational high school, you should take science classes, such as biology, chemistry, and human anatomy. These classes will give you an understanding of how the body works as well as how chemicals react with each other. Scientific knowledge will come in handy when you consult with your clients about their allergies and skin conditions. In addition, science classes will give you the background necessary for understanding bacteriology and equipment sanitization—subjects you will most likely study in cosmetician courses following high school. Since you will be working with many different clients in this career, consider taking psychology courses, which will give you an understanding of people and their motivations. Take English and speech classes to develop your communication skills. Finally, take art courses. Art courses will allow you to work with your hands and help you develop your sense of color.