highschool.. =]
step outta class towards the end for a "bathroom break" and go searching down random halls.
if a chick is approaching you, give her a quick glance and keep walking towards her. once you are within 12 feet of her, if no hall pass is present in her possession, do a funny opener. "exccuse me miss, i just got hired here and i need to see your hall pass, or else im guna need to see u in my office

" or something like that... theres a million things i can think of... and they always worked for me, i'd number close and then see her in the quad with her friends and its hella easy to talk to them from there...
u just gotta be hella funny with it... be strong, just remember.. girls have NO CLASS esp in high school
nab one for me
peace