If a Chinese child gets a B, irrespective of the subject, there would first be a screaming, hair-tearing explosion.
The Chinese mother would intensify her efforts and get dozens, maybe hundreds of practice tests and use every tool at her disposal, to get her child's grade up to an A. Chinese parents demand perfect grades because they take it for granted that their child can get them, and grades are a more important measure of success than "self-esteem". If their child doesn't get all A's the Chinese parents assume it's because the child didn't work hard enough. That's why the solution to substandard performance is always to punish and shame the child. Chinese parents believe that their child is hardy enough to take the shaming and to improve from it.