In one of my lectures we have a Facebook page setup for everyone to ask questions and what not. I saw a girl that i've seen around before and wanted to talk to her so I messaged her helping out with some stuff with the course work. I expanded the conversation a bit and I just need help on how to approach her.

One of my exams coming up, I might be lucky to catch up with her before the exam if I see her around. How do you guys think I should ask her if she wants to hang out? Should I just talk about the exam and tell her that I think shes cute and I would like to get to know her better ?. If she does say yes do I ask her to exchange numbers and ask her what her schedules looking like?

If I miss that opportunity, Would it be creepy if I messaged her on Facebook asking how her exam went, expand further and talk about uni and then tell her that we should hang out sometime?

I'm only new to this so don't take my advice too literally as its only a suggestion.
I would tell her 'hey xyz, I think you will fail this exam and end up on the
Street' before she answers or says anything 'that's okay though at least I'll have
Someone to chat too' then after the Ice has broken just go into your normal convo I guess.
Please note I'm only new and advice may be well off track
Cheers.