GRE requirement:
Domestic applicants and those who attend universities where English is the language of instruction must take the Graduate Record Examination (GRE) (general test) and have their scores reported to the Graduate Division by the Educational Testing Service.
The deadline to take the exam is November 30.

Applicants from countries where English is not the official language must submit official evidence of English language profiecency. There are two standardized tests you may take: the Test of English as a Foreign Language (TOEFL), and the International English Language Testing System (IELTS). The deadlines for taking these exams is November 30.