At the end of the English C1 level you will be able to:
use complex grammatical constructions, clearly argue your position, and express your thoughts on any topic, even unfamiliar ones;
to make your speech more natural, full of expressions and idioms needed to communicate freely with native speakers;
to perceive with ease the rapid speech of native speakers;
analyze and read literature of all types and genres;
you will be able to write scientific texts, essays, letters, reviews, articles, etc;
communicate confidently in working and academic environments;
to take Cambridge Exams CAE, IELTS (7-7.5 points) or TOEFL (96-109 points).