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Whether you are teaching students yourself or employ others to tutor for you, you want to make sure you provide a high quality service. If you can actually help students succeed, you will be able to develop a word-of-mouth business and be able to make your business a real success. If, on the other hand, your students don't improve, you may develop a poor reputation.
The best way to measure how you are doing is to set quality standards. If you tutor students preparing for standardized tests, set a number of exam points that you want to see your students improve. If you tutor kids in a class, set a goal to help them improve by at least half a grade or more. Many tutoring companies set these standards and even offer parents and students a money back guarantee if the goal isn't met. This can help you to establish a reputation as a person who lives up to his word, and as long as you are successful and good at what you do, you should be able to achieve the desired improvement most of the time.