what I am supposed to do at school英语作文

What I am supposed to do at school is to gain the knowledge for my career or for my studies at a higher level. So, mastering knowledge is the most important part of school life. However, I am not supposed to place the same focus on every subject. If I am going to do research in a chemistry field, I will not spend as much time on politics as mathematics. If I plan to be a sportsman, I will take P.E. classes more seriously. But,no matter what, I am supposed to learn something at school.