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What is required to maintain the status of a student: Full Time Student
The amount of credits required to maintain the status of a student is 12-18 credits, which is recognized as a full time students. Occasionally language schools may offer 6-8 credits, recognized as a part time student. and if you take fewer credits in order to reduce your expenses, you will end up losing your F-1 status.
You must be a full time student, not a part time because it is the only way you can maintain your legal status as a full time F-1 student.