Have a good time. Looking at this teaching aid repeatedly is very friendly to students with weak foundation. This book is thick, and the questions are comprehensive. Basically, each knowledge point will correspond to a topic, which is very detailed. The synchronous version follows the textbook and pays attention to the foundation. Can be used for preview or after-school review. The college entrance examination edition has a huge number of questions and the overall difficulty is moderate. Most of them are basic and intermediate questions. Suitable for students with intermediate level and below.