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Running a tutoring business can be as simple as helping fellow students out with the subject you are majoring in, or you can branch out and offer to tutor elementary, junior high, and high school students. If you did well on the SAT, you could even run your own SAT tutoring business where you tutor students for this important college admissions test.
Print fliers, run an ad on Craigslist, and mention to instructors the discipline that you will be offering tutoring services to students. Keep integrity (i.e. the student completes the work, and not you) and you will be surprised at how your client base will grow through word of mouth. Also, make sure you hand out business cards and place them in cafés near campus at every available opportunity.