F-1 students in the U.S. need to renew their visa status before the end date on their I-20 form, which indicates the expected duration of their study. Students can apply for reinstatement using Form I-539 without leaving the U.S. or by requesting a new I-20 and applying for a fresh visa from their home country. Additionally, study ESL offers assistance with F-1 visa renewals and extensions for international students.