If you're in an abusive situation, get out as soon as you can. Start researching into options. Call the hotline for abusive women and see if they can refer you to resources that are available in your area. School is not a priority right now...your life is. And trust me...speaking from experience as a child who grew up in that environment, the abuse will get worse and worse as it goes on.
I grew up in a very abusive home life. My father was very abusive to us, but especially to my mother. We were in and out of the shelters. As in most abusive relationships, my mother always ended up going back to him based on empty promises and his roses. To this day I hate the sight and smell of roses because of what it had came to represent in my life. There were times that we had to get out immediately...I've slept in cars, ditches (one time it was snowing), behind buildings, and any place we could find. There were times my sisters and I had to resort to eating out of a dumpster. Ironically at home we were used to eating out of silver silverware with the best tablecloths and expensive five-course meals. Eventually I learned to skip lunches and save the money for emergencies. We sisters even had a code system that we developed...who was going to grab the babies, who was going to open the door, etc. I also stocked up on food and other essentials in a bag. I started doing that as young as seven or eight years old. There were times my mother didn't have time to grab us girls...she had to leave immediately to save her own life. Those were the worse times...and even though I know she had to do it, I still deep down resent her for leaving us kids alone with a manic. Most of my anger is directed at her, not him. She had the options of leaving more than once...and she could have started over. Yes, it would have been hard. She had five kids...and didn't even have a high school diploma. But - I'd rather live in a shack feeling safe than in the huge house we were living in...and feeling scared all the time.