You must complete your program of study before the expiration date on your I-20.
If you don't complete your program on time and cannot get an extension, you are considered out of status and must apply for reinstatement with the U.S. Citizenship and Immigration Services.
You can become eligible for a program extension if you meet all these requirements:
Submit the following documents to the International Student Office at least 30-60 days before your I-20 expiration date.