However, this book is not recommended for those who are only used to take the second-level constructor exam. 2 1 version, published at the same time as the new textbook 2 1 version. That is to say, this kind of teaching materials can't be compiled according to version 2 1, but according to version 20. Moreover, it can be seen from the bad reviews of JD.COM Tianyi official store that many contents of this tutorial book do not correspond to the contents of the 2 1 version textbook, nor are they written according to the chapters of the official textbook, which makes the candidates confused and finally forced them to buy the official textbook of the architectural engineering version again. It is recommended to buy a high-frequency test center published by the Architectural Engineering Society. Therefore, everyone should choose the appropriate teaching materials according to their own needs.