Book excerpt: The International English Language Testing System, or IELTS, is an international standardized test of English language proficiency for non-native English language speakers. It is jointly managed by the British Council, IDP: IELTS Australia and Cambridge Assessment English, and was established in 1989. Achievement in this qualification is benchmarked against the Council of Europe's Common European Framework of Reference for Languages (CEFR), from level C1 Advanced (CAE) to C2 Proficiency (CPE) of the CEFR. We collect 2100 English Vocabulary in C1 Advanced (CAE) and 3000 English Vocabulary. Based on our many years' experience in HSK and IGCSE Chinese teaching and course contents preparation, we find vocabulary level classification is so important. Students can use CEFR levels for self-assessment so that they can more clearly define what they need to work on, and work out what they would like to achieve in their target language. Our Classified Chinese vocabulary list HSK and IGCSE has total 12000 vocabularies with the Best English Translation for better understanding. Many students call it "LIFE SAVING STRAW" for their exam. This book is a great success and encourages us to work beyond it. Based on our pass experience and data collection, by referring the authoritative resources like Cambridge and Oxford dictionary, here is our painstaking effort!