China daily is an English newspaper, which can not only improve reading level, but also improve vocabulary. But if the vocabulary is small, you need to look up a lot of words at first, but if you stick to it, your reading volume and vocabulary will be greatly improved.

New Concept English 3, the brand of New Concept is well known. Many people who haven't learned English, or who have a poor foundation, start with new concepts. Now that they are in college, Book 3 can be upgraded on the basis of consolidating high school.

If you take the CET-4, it is essential to have a vocabulary book of CET-4 (New Oriental, Spark and many others) and real questions of CET-4 over the years.

If you want to improve your English, words are the foundation. Persistence is the key in the learning process, and you are sure to learn well.