Noon is 11:50, Wednesday and Friday is 3:30, and the rest is 4:10 p.m.

2. What do the children do during the extended hours of the class? Is the teacher tutoring homework or something else

Mainly depends on the teacher's schedule, some classes tutoring homework, some let write close to the word, some talk about the day's learning content of the difficult, there are also times when the free writing homework.

3. Is there really a difference between the so-called fast class and the poor class?

From the looks of it, the teachers in the custodial classes are a bit more senior than those in the regular classes, and it is true that the custodial classes are better than the regular classes in terms of overall performance each year. As for fast or slow classes, I think it still lies in the children themselves.