How to escape my truly evil mother? Edit?

OK here goes. My mother is a schizophrenic, a pathological liar, and all- round mentally abusive, manipulative, evil scumbag. My existence happened because she got into a relationship with a psychopathic pedophile whom she was warned was evil beforehand, but she still proceeded to get with him. Inevitably things went south and they split up, I lived with my scumbag father for the next 12 years and then beat the **** out of him one day when his abuse became too much. Then I went to live my scumbag mother and her husband. For the first month things were okay (she put on an elaborate act) then she proceeded to play all sorts of twisted mind games on me. She liked, and still does now and then, to tease me with information she tries to get me curious about things so that I will want to know more and ask her and then she will play coy with me to try and get me to panic, with I think gives her a feeling of power I've never seen a human being so manipulative in all my life (I strongly suspect she has something else apart from schizophrenia, she once came for me with a knife). Her husband doesn't care about her and just uses her for the disability money she gets for having schizo and he even admits he uses her to her face. The problem is I want to leave (due to massive stress and her damaging my education) and have nothing to do with her but if I do this she will tell massive lies about me to people and she will get her husband (who doesn't care about her) to cause trouble for me...