Your English language level is based on the Common European Framework of Reference (CEFR). http://www.coe.int/t/dg4/linguistic/cadre_en.asp
This standard framework allowed standardized guidelines for a common base within the European community. The levels are divided into six main levels. These levels could also be divided into a number of sublevels to make clearer distinction of competence level.

Common European Framework
Can Do Statements 

A1 - BREAKTHROUGH 
Can understand and use familiar everyday expressions and very basic phrases aimed at the satisfaction of needs of a concrete type. Can introduce him/herself and others and can ask and answer questions about personal details such as where he/she lives, people he/she knows and things he/she has. Can interact in a simple way provided the other person talks slowly and clearly and is prepared to help. 

A2 - WAYSTAGE 
Can understand sentences and frequently used expressions related to areas of most immediate relevance (e.g. very basic personal and family information, shopping, local geography, employment). Can communicate in simple and routine tasks requiring a simple and direct exchange of information about familiar and routine matters. Can describe in simple terms aspects of his/her background, immediate environment and matters in areas of immediate need. 

B1 - THRESHOLD 
Can understand the main points of clear standard input on familiar matters regularly encountered in work, school, etc. Can deal with most situations likely to arise whilst travelling in areas where the language is spoken. Can produce simple connected text on topics which are familiar or of personal interest. Can describe experiences and events, dreams, hopes and ambitions and briefly give reasons and explanations for opinions and plans. 

B1+ - STRONG THRESHOLD 
Can take messages communicating enquiries, explaining problems; provide concrete information required in an interview/consultation (e.g. describe symptoms to a doctor) but does so with limited precision; explain why something is a problem; summarise and give his or her opinion about a short story, article, talk, discussion, interview, or documentary and answer further questions in detail; carry out a prepared interview, checking and confirming information, though he/she may occasionally have to ask for repetition if the other person's response is rapid or extended; describe how to do something, giving detailed instructions; exchange accumulated factual information on familiar routine and non-routine matters within his/her field with some confidence. 
B2 - VANTAGE 
Can understand the main ideas of complex text on both concrete and abstract topics, including technical discussions in his/her field of specialisation. Can interact with a degree of fluency and spontaneity that makes regular interaction with native speakers quite possible without strain for either party. Can produce clear, detailed texts on a wide range of subjects and explain a viewpoint on a topical issue giving the advantages and disadvantages of various options. 


C1 - OPERATIONAL PROFICIENCY 
Can understand a wide range of demanding, longer texts, and recognise implicit meaning. Can express him/herself fluently and spontaneously without much obvious searching for expressions. Can use language flexibly and effectively for social, academic and professional purposes. Can produce clear, well-structured, detailed texts on complex subjects, showing controlled use of organisational patterns, connectors and cohesive devices. 

C2 - MASTERY 
Can understand with ease virtually everything heard or read. Can summarise information from different spoken and written sources, reconstructing arguments and accounts in a coherent presentation. Can express him/herself spontaneously, very fluently and precisely, differentiating finer shades of meaning even in more complex situations.