CEFR Level description (C1)

C1 Effective Operational Proficiency or advanced
At this advanced level the candidate can understand a wide range of demanding, longer texts, and recognise implicit meaning. They can express ideas fluently and spontaneously without much obvious searching for expressions. Their use language flexibly and effectively for social, academic and professional purposes. They will be able to produce clear, well-structured, detailed text on complex subjects, showing controlled use of organisational patterns, connectors and cohesive devices.  Only when exposed to heavy accents and idiomatic language will the user struggle to understand.