International English Language Testing System
IELTS is an internationally recognized test that measures level of English proficiency. The IELTS exam is accepted by more than 9000 institutions worldwide. IELTS exam is divided into two categories: Academic and General. Although there is no big difference between them, Academic IELTS is a test which should be taken by those who intend to study at universities in countries where English is an official language. General IELTS is a test which must be taken in order to prove the level English proficiency of those who want to immigrate to countries where English is official language.