I don't know your mother obviously, but I'm sure she was just yelling at you because she cares about you and wants the best for you. Better to be angry at you then completely apathetic and doesn't care at all what you do, right? I could be missing something here. I don't know if your mom is abusive or anything but I'm sure deep down inside she cares a whole lot about you. People have their flaws. I'd forgive her and move on with it. Good luck with your classes.