1. Keep your PASSPORT valid at all times.
For information on how to renew your passport, please contact your country's embassy at  these web sites:
Embassy web sites:
The Embassy Page: http://www.embpage.org/
The Electronic Embassy: http://www.embassy.org/
2. You must register full-time as a student during the academic year.
Full-time means that as an undergraduate, you must register and complete at least four courses each semester; as a graduate student, the full-time course load is defined by your school or department. There are some exceptions to this regulation such as your medical condition may not allow you to maintain your full-time course load or in your last semester, you may not need four courses to finish your degree. In either of these events, please talk to the OISS staff if you have some exceptional reasons.
3. An exchange visitor scholar must engage in the activity described on his or her DS-2019 form