13 hours a day

So when I go back to school I'll have to go to day school and night school which would be a total of 13 hours a day ._. I don't see how I'm going to pump that much! They don't understand.how am I gonna pump that much before school or during and I don't know how I would keep it good. They are frustrating me and It makes me sort of wanna just resort to formula feeding. My mom suggested I take a year off of school then go back once he can eat semi whole foods.