Examination registration is related to education and training, which is different from examination materials and belongs to education and training rather than virtual materials.
Categories will also be divided into first-class categories and second-class categories, and some will be extended to fifth or even sixth-class categories. For example, clothing is a first-class category, and then clothing is divided into men's wear, women's wear and children's wear, which can be defined as a second-class category. The next category is the detailed definition and division of men's and women's clothes.