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You have to apply to the college and get accepted. All colleges have a different application process, and they all have different academic requirements. You can usually find information about it on their website under admissions. The only exception I can think would be community colleges. They still have an application process, but they don't really have any academic requirements, so anyone can get in.
eri
All colleges require at least a high school diploma or GED to enroll. Some have more requirements, some do not.
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Each college is different. You have to go to their websites and check.