I have a 12 year old daughter who always tear up her school or regular clothes. She is either cutting them or tear them up. She is too big for that. What can I do about it because I do not have money to throw away like that. She tears everything that comes her way. I am furious. Is this normal?

She can't appreciate what she has if she knows that she can just ring a little bell and have it replaced for her. It'll be hard, but she has to learn that lesson and if she wants new clothes, make her do chores to earn them. It's easy to destroy something that you didn't have to work for, and I don't mean chores like sweeping the floor, I mean, hands and knees scrubbing the floor.
I'd encourage you to seek psychiatric help for her, but don't exactly feel sorry for her. This is a great opportunity to teach her about the value of money and possessions and the importance in taking care of your stuff.
My sister had the same damned problem at that age, and after a few months of going to school looking like a damned rag doll because she couldn't wear half her pants, she decided that she wasn't going to rip her clothes up anymore. You're the parent, you're in charge.
http://www.herald-dispatch.com/life/x809657898/Taking-child-out-of-Garden-of-Eden-will-stop-tantrums
Granted this was written for a 4 year old child but it's something to consider.