1. Language category: English, Chinese speech, hosting, recitation, etc.
2. Thinking categories: mathematics, Go, brainstorming, etc.
3. Sports: football, basketball, roller skating, martial arts, etc.
4. Fine arts: children's painting, piano, dance, vocal music, etc.
5. Science: computer programming, scientific experiments, etc.
6. Social categories: small press groups, reading clubs, etc.