text: But maintaining a B average can also help you. If you are in a sport, you say to yourself "hey if I keep my grade to a B average, then i can stay in my sport. " That to me is what helps most kids or teens that are in a sport . I could also see why my principal would change the grade is, because he/she has more students trying out for sports and also that he needs a good grading report from all of his students and half of his students are in a sport so that is why.