The biggest advantage of new concept English textbooks is that the overall system is good and the independence of the four books is good. You can start with the first book or any book. This book was written by an Englishman, L.G. Alexander, which ensured the consistency of the compilation concept of this book to the greatest extent.

Let's talk about learning first:

The first book is the most basic daily situational dialogue, that is, the kind that you can read the whole book without words. Maybe you will be a little disdainful. What's the point of such a book? In fact, learning a language mainly depends on practice, mouth and ears. If you can blurt it out with your mouth open, your English level will be excellent, even if you know the basic daily conversation. A new concept book, you can buy a book and a tape to get a repeater (mp3 is also ok). If you can't listen to and imitate pronunciation repeatedly, you must pick out the pronunciation of every phonetic symbol and every word. This is very important for learning English, whether you are listening or practicing in the exam. The following is a wonderful speech by Du Li, president of Wuhan New Oriental. I hope it helps you.

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Check:

This is a very direct and effective way to prove your learning level. However, as mentioned in the third volume of New Concept English for Teachers, examination should not be regarded as the fundamental purpose of language learning, but as an additional product and a quiz.

You said you were a senior one, so I suggest you mainly work on the second book. The third volume is a bit difficult, but the basic theory of basic grammar has been fully reflected in the second volume. If you can study hard and memorize the words of CET-4, I believe passing CET-4 should not be a problem.