My parents are tired of me?

Well today I came home with a report card of all A's but one C+. My mom completely flipped out! Its for algebra though... I'm in 7th grade and Algebra is a high school class! My teacher is the worst. All our classmates didn't even pass too! Well I passed but my mom thinks its horrible! I keep telling my mom that everyone got C's and lower in her class. But she doesn't believe me.. She said that its just an excuse. Well I can't study when my teacher doesn't teach me anything. When she does I get frusterated cause I cannot understand.. No one can. She moves on to the next problem without asking who got it right and who got it wrong. WHen we ask her a question she just show us to do it and it doesn't really teach us anything. Its over now so I can't go back to my school to talk to her... My mom is completely pissed off at me and keep bad mouthing me. I can't take it. She is going to cut my internet, phone, and TV.. I mean really! I transfered school twice this year. WHen i was at my old school, I had an A up til I moved to my new school. ANd that was about second trimester third quarter. ( 2 semesters in a year here). Still she says its a excuse. She is also hitting me. I am asian btw so I guess that's why she is so strict. Now she is saying that she feed me keep me warm and help me whenever I need and come home with a grade like this. She is mad and said im done with this... I got no dinner..