Here is an overview of all language proficiency levels and a description of each level according to the Common European Framework of Reference (CEFR):
A1 - Beginner
Can understand and use familiar everyday expressions and very basic phrases, which address needs of a concrete type. Can introduce himself/herself and others and can ask and answer questions, such as: Where do you live? Where are you from? What kind of things do you have? Can describe people in basic terms and interact easily as long as the other person talks slowly and clearly. 80 - 200 hours of lessons; about 600 words of language usage.
A2 - Basic
Can understand sentences and frequently used expressions related to everyday activities, such as shopping, family, work, local geography, etc. Can communicate about routine tasks requiring a simple and direct exchange of information on familiar matters. Can easily describe own background and education, immediate environment and immediate needs. 200 - 350 hours of instruction; approx. 1,200 words of language usage.
B1 - Intermediate level
Can understand the main points of clear, standard input on familiar matters regularly encountered at work, school, in leisure activities, etc. Can deal with most situations, which are likely to arise when traveling in an area where the target language is spoken. Can express himself/herself in a simple and coherent way on familiar topics and personal interests. Can describe experiences and events, dreams, hopes and ambitions and briefly give reasons and explanations for opinions and plans. 350 - 360 hours of instruction; approx. 2,500 words of language usage.
B2 - Upper intermediate level
Can understand the main ideas of complex texts on both exact and abstract topics; can also understand technical discussions in his/her field of specialization. Can interact with a degree of fluency and spontaneity that makes regular interaction with native speakers on both sides quite possible without strain. Can express himself/herself clearly and in detail on a wide range of subjects, explain a viewpoint on a topical issue and indicate the advantages and disadvantages of various options. 600 - 800 hours of lessons.
C1 - Advanced
Can understand a wide range of demanding, longer texts and recognize implicit meaning. Can express himself/herself fluently and spontaneously without much obvious searching for expressions. Can use the language effectively and flexibly in social and professional life or in training and study. Can express himself/herself clearly, in a structured and detailed manner on complex subjects, using appropriate linking language/wording. 800 - 1000 hours of lessons.
C2 - Competence
Can easily understand everything read or heard. Can summarize information from different spoken and written sources, reconstructing arguments and accounts in a coherent presentation. Can express himself/herself spontaneously, very fluently and precisely, making finer shades of meaning clear even in more complex situations. 1000+ hours of lessons.