IELTS High-frequency Vocabulary Pocket Book selects around 4100 words appearing twice in the Cambridge IELTS series and arranges the words according to the decreasing frequency. The book includes two parts: the first part is relatively easy with a list of 500 words of highest frequency for examinees to self test and self study; the second part collects words of frequency ranging from 2 to 24, which should be grasped by examinees, with associated parts of speech, phonetics and all the interpretations included together.