In order to prevent any last-minute issues that might compromise their plans, applicants should also be aware that visa processing times can vary and that it is wise to apply well in advultimate rummy freeance of the date they intend to begin. In order to apply for an F1 visa, candidates must gather a thorough set of documents proving their eligibility and desire to study in the US. The Form I-20, which is issued by the SEVP-certified institution and contains vital information about the student's academic program and financial assistance, is the most important document.