OV, maybe this guy is her brother or it could be some nerdy guy trying to get in her pants by giving her rides. Take control and ask her if she'd like to go for coffee or something. There is a point in a convo when it becomes VERY CLEAR that a girl is interested in you so when you feel like she's really into you, go for it and ASK HER OUT. You have nothing to lose dude. Also, try to ask some questions that don't focus only on school, flirt a little, pay attention to small details...Trust me, she'll be very impressed.
-to be nobody but yourself in a world which is doing its best, night and day, to make you everybody else means to fight the hardest battle which any human being can fight; and never stop fighting.- e.e.cummings