I would say that things that need extreme concentration (studding), would be almost impossible. Work for me is so repetitive I don't have to think about it. You should try to keep up on studdies though! Try studing with a few friends so your mind doesn't wonder. Take baby steps if you have to but definitely start doing the things you use to do, I don't think she would want you to sit there and do nothing. I always liked a funny movie, they always cheered me up (stay away from depressing ones). If your Mom had some goals for you maybe it would make you feel better if you fulfilled some of them. I'm sure she would have wanted you to finish school.

Definitely, keep busy!