I tend to have that sort of problem also. Personally, I try to cram everything in between lunch hours and classes. Keeping ears open for lectures and doing another class' work at the same time--only if the teachers would allow it. Sometimes I would skip a day of homework because of how exhausting it is, but in the end, I'm sure it'll be worth it.
It just depends on how you prioritize yourself along with how determined you are. You might end up getting use to it. I have.
