Abusive father

I'm 20 year old undergraduate student. My father had been a parasite to my mother ever since I came to consciousness. He is mentally abusive to my mother by forcing her to give him money for his daily needs and cigarettes as he is unemployed. My mother has gotten used to it and takes care of all his needs. It's her personal decision so I can't interfere. I never had a relationship with my father. He spoke to me hardly little less than 50 times ever since I was born. He never took any of my responsibilities expect giving his Signature in my report cards. But today in an heated argument he held my hand and got physically violent . My thumb has blood clot marks all over and has undergone visible trauma. He also threatened my mother to hit me (when she tried to stop him from hurting me) or he will force a divorce. He also kept saying he won't sign on any parers for my higher education in case if necessities and won't be associated with me. I ran away from my parent's everyday toxic arguments and seeing my mother getting abused left and right at class 11. Please help me as in what ways can I get away from this problem permanently and if I need Signatures of both parents in my higher studies is there a way to go around this rule and not ruin my future with just having one parent I.e my mother around me ?