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How to be a good mathematician
Develop your interest in high school.
Maybe you have always been fascinated by numbers and how formulas explain the world in which we live. If you think mathematics might be something you want to pursue further, focus on your math courses in high school.
Ask your teachers for extracurricular activities you can participate in to hone your math skills, such as quiz bowl or mathletes. Compete in mathematics competitions such as the international mathematical olympiad.