Being accepted into an institution that has been approved by the Student and Exchange Visitor Program (SEVP) is the first step in the multi-step F1 visa best site for slotsapplication process. Students who are admitted are given a Form I-20, which is an important document that describes their program and verifies that they are eligible for an F1 visa. This document, which is proof of enrollment in an authorized academic program, must be submitted when applying for a visa.