Volume two-candidates preparing for the college entrance examination and CET-4; Learners who already have a high school English foundation and want to supplement and improve.
Volume 3-candidates who want to get high marks in Band 4; Candidates who are preparing for CET-6, TOEFL and IELTS; Learners who are proficient in English and want to improve their reading and writing skills.
Volume four-candidates who are preparing for the entrance examinations for master's and doctoral students and various examinations for going abroad; English major; Senior white-collar workers working in English environment; Learners who want to improve their English.
Which book to start with depends on your foundation. If the foundation is poor, it is recommended to learn from the second book, which basically contains all English grammar and basic vocabulary. If you want to take the postgraduate entrance examination, it is recommended to know and understand the grammar vocabulary of the first 30 lessons in Book 3 and Book 4. If you have perseverance, you should keep reciting and try to blurt it out. If you memorize both books, it's nothing, and GRE is easy. ...
To put it bluntly, postgraduate entrance examination means postgraduate entrance examination English, and postgraduate entrance examination English means postgraduate entrance examination reading. After reading Book 4, your English will be improved to a new level. ...