From the article:
Two months earlier, Battushig, then 15, became one of 340 students out of 150,000 to earn a perfect score in Circuits and Electronics, a sophomore-level class at M.I.T. and the first Massive Open Online Course, or MOOC — a college course filmed and broadcast free or nearly free to anyone with an Internet connection — offered by the university...
Battushig was one of 20 students, ranging in age from 13 to 17, to enroll in the class. About half dropped out. The course is difficult in any setting — M.I.T. sophomores often pull all-nighters — and the Mongolian students were taking it in a second language. Battushig, however, thrived. “I can’t compare it to a regular class,” he said. “I had never done that kind of thing before. It was really a watershed moment for me.”