The knowledge points are comprehensive and the difficulty of the topic is moderate.

1, comprehensive coverage of knowledge points: Shi Chao Golden Book contains knowledge points of all grades and subjects in primary schools, which can help students comprehensively review and consolidate what they have learned.

2. The topic is moderately difficult: the topic setting of the World Superbook is moderately difficult, neither too simple nor too complicated, and it is suitable for students to improve themselves after class or during holidays.