College German is a book for German majors, while the newly compiled College German is a book for non-German majors who choose German as their second language. These two books have their own advantages. The former is more detailed and systematic, while the latter is more flexible and pays attention to the cultivation of communicative competence. You can look at them all. However, if time is pressing, I suggest you focus on your demand reference books. After all, it is more closely related to the exam. As for the degree, it depends on the individual. How shallow and deep you want to learn depends on your efforts in it. I am learning German as a second foreign language now, and I use the newly compiled college German. I think it's ok. I think the biggest advantage of this book is that it doesn't give you all the knowledge points, so that you can think and explore the learning space, which is very helpful for autonomous learning.

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