Connect language ability with work activities. Writing messages, reading documents and speaking may be at different levels. Give a certificate's exam name, result and date accurately. Do not present self-assessment as a formal test.
CEFR levels run from A1 to C2, but understand the level you choose. Avoid arbitrary percentages. Match the document language to application instructions and check translated meaning. If language is assessed at interview, the CV should reflect your actual ability to perform the relevant activities.
Detailed guide
Writing a CV in English: six checks beyond a literal translation
