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.
Sarawut Pongsuwan, our M6 student who is in C1 Level or Proficient Level in CEFR.
Kanyanat Julsaeneechorn, our Independent user (B2) of English Language
Sai Kyaw Ko Ko, our Upper Intermediate Level (B1) in CEFR.