B2 corresponds to the upper-intermediate level. According to the CEFR, students at this level can...

• Understand the main ideas of complex text on both concrete and abstract topics, including technical discussions in his/her field of specialization.
• Interact with a degree of fluency and spontaneity that makes regular interaction with native speakers quite possible.
• Produce clear, detailed text on a wide range of subjects and explain a viewpoint on a topical issue giving the advantages and disadvantages of various options.