All applicants whose native language is not English or who have not received their undergraduate education in a U.S. college or university must submit scores from one of two internationally recognized assessments of English language proficiency, the Test of English as a Foreign Language (TOEFL) or the International English Language Testing System (IELTS).
Applicants whose native language is not English but who have received their undergraduate education in an English language speaking country do not have to submit these scores. Non native English speakers who graduate with an undergraduate degree from an institution whose language of instruction is English but not in an English language country must submit scores from either of these tests. All requirements are based on your undergraduate education regardless of any graduate education. The Graduate School does not offer waivers of this requirement.
“Native language” is defined as the language you grew up speaking in your family, your community, or your nation.
For More Information: English Testing