IELTS

The International English Language Testing System is a standardized test for assessing proficiency in English of students or job aspirants applying to English speaking countries. This comprehensive test, covering all major language skills (reading, writing, listening and speaking), is co-managed by IDP: IELTS Australia, University of Cambridge ESOL and British Council, and is held at more than 1000 locations around the world.

See more here….
http://www.ielts.org/