1. Daily practice is not free because it was sold in Tik Tok in 2022. Everyday practice is a learning APP for primary and secondary schools under Lele Classroom. It was first developed by scholars from Tsinghua and Peking University, and then gradually added many subjects such as Chinese, which provided great help to students' study, so it was inevitably expensive.

2. According to the data of official website, if you practice every day, the State Education Bureau will provide a set of test papers and application exercises, and each unit has unit knowledge points, so research and development will cost more, so it will inevitably cost.