World tests in English

CAMBRIDGE

http://www.cambridgeenglish.org/

http://www.cambridgeenglish.org/why-cambridge-english/global-recognition/index.aspx?s=1

http://www.cambridgeenglish.org/images/126130-cefr-diagram.pdf

IELTS

http://www.ielts.org/

https://www.futurelearn.com/courses/understanding-ielts?utm_source=BC_IELTS_takeielts&utm_medium=web&utm_campaign=Understanding_IELTS_May15


BRITISH COUNCIL

http://takeielts.britishcouncil.org/