My teacher threatened my life, what should i do?

so in english class, she was teaching and it was normal, and she handed back tests, and mine was an F but the student next to me was an A, i was really mad because i copied off him so i went to the teacher and asked why I did so bad, and she said she saw me cheating, and i said I didn't because i was scared and... show more so in english class, she was teaching and it was normal, and she handed back tests, and mine was an F but the student next to me was an A, i was really mad because i copied off him so i went to the teacher and asked why I did so bad, and she said she saw me cheating, and i said I didn't because i was scared and she SCREAMED "BE HONEST!!!" and i didnt answer and she suddenly started BEATING me like crazy and i ran away from her and she threatened to kill me if i ever set foot in her class again. i go to a public US high school and i dont know what to do. im so scared because i have to go to her class monday because its my schedule...
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