Yes, you can be a part-time student on the IELP since they offer both full-time and part-time study. Some educational institutions provide the IELP within 4-weeks or 8-weeks sessions.  Part-time IELP classes are also suitable for those individuals who do not plan to pursue a degree program in the university where you have taken the IELP. And also, if you do not need an F-1 visa.