IELTS 雅思英語 IELTS course Winki Chan, norman ng 任教IELTS課程， IELTS 國際英語測試 International English Language Testing System IELTS is the International English Language Testing System. It measures ability to communicate in English across all four language skills – listening, reading, writing and speaking – for people who intend to study or work where English is the language of communication.