The remedial classes can be roughly divided into two aspects, one is to learn from each other's strengths. Many training courses are aimed at developing children's specialties. For example, give play to children's artistic specialties, such as piano, dance and vocal music, as well as art, Go or robots. There is also the Olympiad, which I think is also to give full play to children's mathematical expertise. In mathematics, children who have the spare capacity to study can develop their mathematical thinking through Olympic Mathematics.
To participate in this kind of remedial class, children should have great interest in this aspect, or children have great talent, so as to get better development in this kind of training class. But if a child who doesn't like music is forced by his parents to go to a piano training class, it is very painful for the child. A child who is not good at math will not improve his math performance, and may also affect his interest in math.
There is also a remedial class that complements each other. There are many remedial classes, which may be aimed at Chinese, mathematics, English and writing. For example, some children have poor oral English and listening skills, and their parents send them to training classes to make up for their shortcomings.
There are all kinds of training courses, and there are many reasons for attending remedial classes. But in any case, parents should not listen to other people's advice. Other people's children should go to school, and so should their own children. From the perspective of your child, see which long boards can be strengthened and which short boards can be supplemented. Only by rational observation and analysis can children's training classes be effective.