The People's Education Edition is a textbook compiled and distributed by the Central Education Bureau, which is aimed at all provinces in China. The difficulty is low, because remote areas in the west should also be considered.
Students in Zhejiang, Jiangsu and other coastal provinces are generally superior to students in western provinces in science, which is also reflected in the results of the national unified college entrance examination. Therefore, the education bureaus of these developed provinces, taking into account the students' foundation, have compiled their own teaching materials, which is more difficult than the national unified teaching materials.