https://www.blackplanet.com/cavesofa28/message/21922872

You must have your Form I-20/DS-2019 every time you enter the US – should you take a trip exterior of the US you will need the SEVIS type to re-enter the nation. F-1 and M-1 visas could be issued up to 120 days upfront of your study start date, however you will not be allowed to enter the US earlier than 30 days earlier than your sta