[중고]Cambridge IELTS 3 Student's Book with Answers : Examination Papers from the University of Cambridge Local Examinations Syndicate (Paperback, Student ed) - Cambridge IELTS 6
[중고]IELTS Practice Tests (Paperback) - Cambridge IELTS 2 Student's Book with Answers: Examination Papers from the University of Cambridge Local Examinations Syndicate - Cambridge IELTS 4