The IELTS (International English Language Testing System) test provides an evaluation of English for those who wish to study or train in English. IELTS is a jointly managed test by the University of Cambridge ESOL Examinations, the British Council and IDP Education, Australia. IELTS is recognized by universities and colleges, as well as employers, immigration authorities and professional bodies in Britain, Ireland, Australia, South Africa, Canada, and New Zealand. In the United States, the recognition list includes seven of the eight universities in the Ivy League. The majority of the recognising schools ranked as "Top Schools" in the U.S. News and World Reports on America's Best Colleges 2007, and also the top 25 institutions hosting international students. The prestigious Duke University Graduate School states on their website that IELTS is their "preferred English language test".

Studying for the IELTS test usually involves a long course. The preparation time is similar to that of the TOEFL, FCE or CAE courses (approximately 100 hours). 

IELTS is available in two formats: ‘Academic’ and ‘General Training’. All candidates do the same Listening and Speaking sections. The Academic modules assess whether you are ready to study or train in the medium of English at an undergraduate or postgraduate level. The General Training modules emphasize basic skills in a broad social and educational context not at degree level.

Structure of IELTS?
IELTS tests the candidates in areas of Listening, Writing, Reading and Speaking. LISTENING (30 minutes)
4 sections, 40 items READING (60 minutes) 
GENERAL TRAINING READING
3 sections, 40 items
ACADEMIC READING
3 sections, 40 items WRITING (60 minutes) 
GENERAL TRAINING WRITING
2 tasks (150 and 250 words)
ACADEMIC WRITING
2 tasks (150 and 250 words) SPEAKING (10 to 15 minutes) 
TOTAL TIME: 2 Hrs 45 Minutes.