believe in yourself

　　john is a math teacher who was in the year 1972. he studied at the school in his hometown, and always made mistakes in class and got low grades when he was a child. so that all of his classmates and teachers thought he had no point in studying at school and always laugh at him. this made him felt very unhappy and wanted to left the school, but in the end, he changed his mind which gave up learning and thought he had no reason not to study well. this is the reason why he got an ‘a’ in the end of the year, which made not only his classmates but also the teachers felt surprised.