I think the good child must be positive .
When he study at school ,he would preview maths or chinese for class ,then he focus on those difficult points and understand most of the teachers ' talking,certainly he could answer teachers ' questions correctly .Studying is easier for him than other classmates .He is sure the good student in the view of teachers.
When he stay at home ,he would do some washing or cleaning or sweeping the floor etc,maybe he would take the mails from mailbox each week without parents' asking .
He feels parents' emotions such as happy ,sad ,then he would enjoy the happyness with them ,transfer their feeling from sadness and say "I love you " to them ,take chairs for them when they feel tired or take one cup of water for them when they are thirsty or take out some snacks if they are hungry .I think parents would feel so comfortable if they get the service .He must be good child in the view of parents.