More than just knowing what to say during the F1 visa interview, you also need to prepare by bringing the appropriate supporting documentation. One essentialrummy stat item is your passport, which must remain valid for at least six months after the length of time you plan to stay in the United States. S. . in addition to the Form I-20 that your school has given you. You should also have your DS-160 confirmation page and a receipt proving that you paid the SEVIS fee with you.