Nowadays, the textbooks are generally contemporary college German. Personally, I think it's not as good as our textbook at that time ~ published by Peking University, called German Course ~ FLTRP bought the copyright of this book and adapted it into contemporary college German. Grammar is not as systematic as the original German course ~

For example, many training courses use Approaching Germany, which is suitable for people who go abroad ~ don't pay much attention to grammar ~

It's all personal opinions, for reference only ~

To sum up, German courses are recommended. The publishing house has stopped production, but it may be sold online ~