***4 volumes-New Horizon College English 1 ~ 4, for freshmen and sophomores. Each volume also includes three books: Reading and Writing Course, Listening and Speaking Course and Comprehensive Training, among which Reading and Writing Course and Listening and Speaking Course are available on CD.
When you finish the third book (that is, the last semester of your sophomore year), you can apply for CET-4, and after passing the exam, you can apply for CET-6.