"I hate girls who just spend their weekends getting drunk and doing stupid shit, wasting their time. It's such a turn off. What do you do for fun on weekends?"
Also you could ask about what she wants to do as a career when shes older, tell her something like "You're being judged here... so make it something unique and interesting" in a playful voice.. I suppose.
Picking up school girls isn't my strong point
If she tells you that she likes something, just for a random example, say she comes out with something like "I love Michael Jackson" ...you then say "I hate him. I could never date a girl who likes Michael Jackson. Just wouldn't work out" (again, playful tone) - disqualifying her... she'll start asking why, trying to qualify herself, chasing the conversation.