SAT: Scholastic Aptitude Test I is the required qualifying test, on the score of which most of the US Institutions generally take a decision for admission for all the undergraduate programs. Many universities also require you to take SAT-Subject tests.
Graduate Record Examination is the required qualifying test, on the score of which most of the US Institutions generally take a decision for admission for all the graduate programs.
The Graduate Management Admission Test is a computer adaptive test intended to assess certain analytical, writing, quantitative, verbal, and reading skills in written English.
Test of English as a Foreign Language is a standardized test to measure the English language ability of non-native speakers wishing to enroll in English-speaking universities.
The International English Language Testing System, is an international standardized test of English language proficiency for non-native English language speakers. It is jointly managed by the British Council.