i am in school as well, and i dont go about with routines, specially in the class room speicificly because you will run out of routines and lines fast
my suggestion is that you just simple be friendly, smile, and build comfort and trust, and if you can on the first of second day of being nice get there phone numbers and say "wow you seem really chill for a girl im tired of seeing bitchy girls around all day! feel free to leave me your digits

" and pass her the phone. thats just one way to do it do wutever works mate thats just one i like and its never failed. once you build comfort wait for the weekend to hang with them or even just out to lunch, build more comfort but on the second day or whenever you see them break rapport fast, and increase it to deeper conversations and a fun activity. from there it should be cake
fair warning..gaming girls in the same class can be very very hard..girls catch on to things about guys, think you are a player, and talk about you. just remember that
mR.e