I don't think it is necessary to choose an excellent class, because it will not improve children's ability, but will make them feel inferior. But if it is a diagnostic test, I think it is still feasible to know which ability the child failed, because targeted training is also a good thing.
The main function of the training course is to make up for some poor abilities. His main function is to guide children's ability. Where should we strengthen some of our children's abilities to cultivate them? If you can't take part in this training class if you can't reach your ability, then I think this exam is unnecessary, because the most important thing in the training class is to cultivate children's ability. Instead of choosing the best training from this group of children, this not only makes parents spend more money, but also does not improve the children with strong ability.
Generally speaking, a training course is an institution to guide and enhance capabilities. Although it wants to make a profit, it also needs to show its value. If it can't teach poor students, what is the significance of its existence? Every child can be strong enough to choose the best, but most of them go to cram school because their ability can't meet the expected requirements.