It is good to care about your grades.
John is in High school and has final exams coming up, which he hates taking.
John wants to finish the exams quickly.
John decides to study hard, so he can breeze through the final exams.
John just randomly fills in the multiple choice questions on the exams, so he can finish quickly.
John speeds through the finals and passes with flying colors.
John fails the exams and is held back a grade.