If you are at a university, your primary objective is to be creating your future career. You can do this by achieving high marks, being involved, etc. No one likes doing poorly in school, it inhibits your intelligence. If you do poorly you won't have the self-esteem required to do non-academic tasks with confidence. Do well in school. Do it for the relief of stress it will provide. I find when I concentrate on school and completing my primary goals, i can concentrate better on other hobbies i have because i have the basic priority goals of my current university life handled. Listen to me because goddamnit, i accomplish a lot.