Tianyi project textbook is different from the official one?

Of course it's different, otherwise the first and second grade gold content will be the same. There is one more engineering economics course at the first level, and other subjects are deeper.

The textbook of the second-level constructor is pirated, but it is not good. China Building Industry Press is still good, the official version. It is recommended to buy official textbooks after taking the second-level constructor exam. It's better not to buy pirated ones, and it won't save a few money. Why not buy official textbooks and give away video courseware? They are sold in Xinhua Bookstore all over the country.