www.uscis.gov/working-united-states/students-and-exchange-visitors/students-and-employment/special-instructions-b-1b-2-visitors-who-want-enroll-school
www.uscis.gov/working-united-states/students-and-exchange-visitors/students-and-employment/special-instructions-b-1b-2-visitors-who-want-enroll-school