books.google.co.uk - The IELTS is taken by over 1.2 million people and is internationally recognized by more than 6,000 institutions in 120 countries. IELTS test scores are used as a measure of English language proficiency by educational institutions, government departments and agencies, and professional organizations. This...http://books.google.co.uk/books/about/Barron_s_IELTS.html?id=g1SQkuN1zvYC&q=least+150+words&utm_source=gb-gplus-shareBarron's IELTS
