The I-94 should remain stapled in your passport at all times. Keep it in your passport at all times and never surrender it when leaving the country. We advise you to make a set of photocopies for yourself in the event you lose any of them and keep them in a safe place. At the School you must be enrolled for at least 12 credit hours each semester to be considered full-time.
Some exceptions apply in the graduate program.
When you travel out of the U.S. and your visa has expired, you must travel to your home country to obtain a new visa, so you can reenter the United States as an F-1 student. Embassies are no longer issuing visas to third country nationals. You will be considered a Transfer I-20 student if you will be transferring from another U.S. school, college or university. If you attended another school as an F-1 student, immigration regulations require that you complete a school transfer procedure to be authorized to attend the School. The School transfer procedure is required even if you graduated from your former school.