Kerel,
I'm in the world of pickup since reading The Game by Neill Strauss just a couple of weeks ago.
I have the same problem but I think my skills are improving
When you're talking to a girl try to listen very carefully to what she's saying
and of course look for IOI's. That's the way to keep the conversation going, and in the future try to let the girl remember you! By asking her if she passed the exam or something. ( BUT don't chase her when she hurry's out off the classroom)
Like justd0it said negging is also very important
Try searching on this forum because I bet that a dozen other guys have the same problem.
Game On!