How do I make my parents stop fussing over exam marks?

I recently had exams, and I think I did pretty well. For English, I got the highest in class, 81/100. Okay, fine, I was careless, but still, I think it's pretty good. For Math, (I'm weak in Math) I got 54/100, which is a pass. I failed my Math the last exam, so then again, I'm happy with it. For Chinese, I almost passed (Weak here, again) and got 40/100. For Science, I admit I didn't do too well, but the paper was difficult. I got 59/100. My parents keep scolding me and yesterday my mother beat me just because of a careless mistake in my Math paper. My father keeps saying I got very low for English. IT WAS THE HIGHEST, I MEAN LIKE, SERIOUSLY? For Math, my mother keeps picking out the careless mistakes and harping over them, and for Chinese my mother just shouts at me, what rubbish. (For Chinese I usually get 20 or 30, so this is kind of like a landmark achievement for me.) For Science, well, you get the picture. And then they keep harping and harping over it, saying that I will do badly in life and blah blah blah. They won't let me use the computer, buy books, do ANYTHING. Last night I felt so sad I had to cry myself to sleep, and now I'm still crying as I type this up...what do I do?