C1 Effective operational proficiency or advanced (proficient user)
Can understand a wide range of demanding, longer texts, and recognise implicit meaning.
Can express ideas fluently and sponteneosly without much obvious searching for expressions.
Can use language flexibly and effectively for social, academic and professional purposes.
Can produce clear, well-structured detailed text on complex subject, showing controlled use of organisational patterns, connectors and cohesive devices.
Can express himself spontaneously, very fluently, differentiating finer shades of meaning even in the most complex situation.