Eviction and Burden

I am trying to finish up school. Might take some extra time but I won't quit. Same with the third-born of us triplet bros. The middle is working but he's a disrespectful addict alcoholic that refuses to get help and torments everyone in the house, especially mom. My other brother and I have been pressing mom to begin the eviction process after the middle one hurt her and has been harassing her for some time now. She is trying to fix the house and I am helping as much as I can on top of working and going to school, and the same goes for the other one in college.
Mom says she doesn't want to end up alone in life, but I told her that her inaction/slowness in acting and getting the middle one out of the house is making the third-born think of moving out. I barely have any money and I'm looking for ways to move out, too. It's just not a fair situation for anyone. How am I gonna be able to focus during this exam at 6pm?