grades

This year I am trying hard to keep good grades. Last year I was careless in not having A's. All my life I always had good grades. This year I really want to try, because I want to go to a good college. I've been noticing that my teachers have giving wrong grades for the work I have done. I have done all my work in my classes, but one of my teachers made my grade a D, by putting 0's on all the work we've been doing in class. I had to talk to the teacher and turn in the work again. Last year, I wouldn't have said anything to the teacher and my grade would stay low. I wouldn't even noticed if I had a wrong grade, because I wouldn't care. I wonder what grades I really deserved last year.