The sparring teacher should guide children how to feel beauty and how to express beauty, which is the core of sparring. Moreover, after the child has finished practicing the piano, he can encourage the child to play the etude again with his parents, and applaud after playing.
As for musical instrument sparring, you should choose VIP sparring. The characteristic of VIP sparring is that if you are not satisfied with the course, sparring teacher and effect, you can get a refund within the validity period of the course.