With over 6000 organizations accepting the test, it is the most widely accepted measure of English proficiency. Universities, government agencies, immigration authorities and large corporates all accept IELTS scores.
If you want to study or work abroad, you will need to take the IELTS. A minimum score on the IELTS is mandatory for those wishing to study or work in the UK, USA and Canada. US and Irish universities also accept the IELTS.