I rarely do my homework. No matter how hard I try to focus and actually get things done, I just can't do it unless it's something I really want to/like to do. And even if I actually put my work right in front of me and turn off my phone, computer, tv, etc. and sit in silence in my room I still can't focus on the work; I'll just stare at a wall.

I'm a very intelligent person and I know I could make straight 100's if I could just do my work. What am I supposed to do?

This is serious -- not only for your present school work but for any of your future tasks. Please discuss this with your doctor. S/he may prescribe a medicine that will help you.