This article is from the FAQ, by with numerous contributions by others.
The school must certify that the prospective student has proficiency in
English (usually demonstrated by passing an English proficiency examination
like the TOEFL) or the student will be enrolled in courses in a language in
which the student is proficient or the student will be enrolled in a full
course of study consisting of both academic courses and English instruction
or the student is enrolled in a language training program constituting a
full course of study.