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During the first year of high school.
Your athletic scholarship during your second or third year and try for the TOEFL.
To take the SAT/ACT during your third year (or your fourth year if you are in a 5-year highschool system).
Finish highschool with good grades and start living your dream in the USA.
If you can't follow exactly these steps, don't worry, you may still be able to win an athletic scholarship and become a student-athlete in an american college.