The Common European Framework of Reference for Languages (CEF or CEFR) was put together by the Council of Europe as a way of standardising the levels of language exams in different regions. It is very widely used internationally and all important exams are mapped to the CEFR.
Council of Europe levels Description
The capacity to deal with material which is academic or cognitively demanding, and to use language to good effect at a level of performance which may in certain respects be more advanced than that of an average native speaker.
Effective Operational Proficiency
The ability to communicate with the emphasis on how well it is done, in terms of appropriacy, sensitivity and the capacity to deal with unfamiliar topics.
The capacity to achieve most goals and express oneself on a range of topics.
The ability to express oneself in a limited way in familiar situations and to deal in a general way with nonroutine information.
An ability to deal with simple, straightforward information and begin to express oneself in familiar contexts.
A basic ability to communicate and exchange information in a simple way.