What's the point?

What's the point of studying so hard and getting good grades for your parents is just a tongue-lashing when there's only one subject with a bad grade? 6 As and a C. The smile when she saw the As, she looked very content, and i was happy, very happy. But, it's all gone when she saw that one C there, it's felt like i lost everything and there it goes, bla bla bla~ I'm already tired of hearing it. So what's the point?