Certified Cambridge Proficiency Exam C2 Teacher Hello :) Non-native bilingual Soc with C2 Cambridge Proficiency Exam certification. I offer English classes adapted to the level and your interests. Classes can be more grammatical, vocabulary, writing or speaking, depending on what you need. There is also the possibility of using Corporate English (English focused on business matters). I am non-native bilingual with the C2 Cambridge Proficiency Exam certificate. I offer English classes adapted to the level and your interests. The classes can be more grammar, vocabulary, writing or speaking, depending on what you need. There is also the possibility of doing Corporate English (English focused on the business world).