College game is easy, just get over your nerves and approach.
My go-to moves (if in a big lecture hall):
The RISHI system (Yes, I made this up because of the DENNIS system from always sunny):
1) Draw attention, I do this by retracting from myself. Walking down the aisle, stumble a little near her (drawing her attention and takes down her perception of you as a thread), and then you can quickly move to step two (initiate contact) and sit next to her.
2) Since you just stumbled its easy for you to initiate with her by saying something along the lines of "i hope noone saw that" jokingly.
3) Secure. This is done by continuing conversation. If the professor isn't there yet, I usually talk about the class, how much the professor sucks/rules, upcoming assignment, etc. Once class starts I usually ignore for a little bit, (around 15 mins in a 50 minute class), then I re-engage. If the lectures getting really boring then I'll draw a tic tac toe board in the corner of her notes, 100% of the time the girl will smile/laugh and play you. From there move into small notes. I like doing a "winner" with an arrow towards me or a "loser" with an arrow towards her.
4) 'Have your way with' -- Once class ends, (while packing up/leaving the classroom) move into real conversation. Start with a "BTW, didn't catch your name" .. once you have to part ways, ask her for her number if you're getting a good vibe, if you're getting an 'ehh' vibe I usually get the number with the pretense of doing homework together/incase we need anything (notes, test date, whatever). Then I become friends with her and fuck her friends

5) Incognito - If you don't friend zone her to get with her friends. Go incognito. This doesn't mean ignore her completely. Just give the bare minimum response and stop sitting next to her in class. Better yet, start talking to another girl in class on the other side of the lecture hall
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If it's a small class, its a similar system but execution changes...
1) Retract from self - Sit next to her and ask for a pencil or something, simple request but shows you aren't prepared in order to lower your threat/bring her guard down.
2) Initiate contact - Handled by the pencil request, but expand a little by asking if shes ready for the upcoming test or something.
3) Secure - My go to question is to ask if they are prepared for the test/exam. This is usually done with the exam like a week away so they are never prepared. I then ask them for their number to see if they want to study/hang out sometime (I choose study or hang out depending on her body language).
4) Have your way with - I hope you don't need help with this
5) Incognito -- Different in smaller classes. I don't recomend doing this until the semester is over.
If you really want to go 'incognito' after getting laid then I would change the system .. once getting her number don't invite her for 1 on 1 study sessions or whatever. Invite her to big parties or if you see her at the bar, fuck her. Then don't talk about it