Eh don't get all caught on if you can tell if she is interested or not...if she is willing to study/ hangout with you then that is a start...if she doesn't want to...then she isn't interested or has a BF etc...if she says no don't act all weird and akward just say "ok thats cool just wanted to ask" from then always be nice to her and still say hello because she might change her mine...always remember to be confident be happy no matter what happens and do not! DO NOT! Be clingy...Act as if you have nothing to loose because you really don't!!!
