I know but I don't like her just because of her looks, there are a lot of other girls that are hot too but she still rather have her. What are some signs that she likes me?

Here's a simple list:

1. She flirts with you
2. Makes a lot of eye contact when you talk to her
3. She enjoys talking with you (acts like it)
4. She drops serious hints for example: she openly tells you, asks you to do stuff with her, she makes positive contact (touching of hands, etc.)

Among other things, if she really does like you then you should be able to tell

And don't search for the signs, let yourself notice them
Make sure she doesn't just like you as a friend

If there's good eye contact and she enjoys talking with you-Go for it!

Okay
If she smiles a lot when she is around you
Makes eye contact
Laughs at almost anything you say when your not being serious
You see her around between every class (it means she's probably looking for you)
Go for it

The fact that you need to ask that question means you need to simplify things. Those are all very specific signs to look for and you can go crazy looking for them.

Make it simple, just talk to her more and get to know her more. Things will happen naturally if she likes you back.