In order to encourage children to achieve good grades in school, many parents educate their children in this way: In school, academic performance is always judged on merits. Either you have good grades or poor grades. In the eyes of the teacher, you are either a good student. Either it is a bad student. Since all students with good academic performance are good students in the eyes of the teacher, every student who does poorly is a bad student in the eyes of the teacher.
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In schools, academic performance is not the only indicator of students' pros and cons