Today at college I was sitting at a bench. There were students passing by. Then came a group of 3-4 girls, how to open them? They would be like "why is he talking to us there are so many other students (girls and boys) also"
There was also a group of boys standing by a side passing comments on some girls passing by.
And then there was this girl (who was talking on the phone) with her female friend and after a short while her friend left with a guy for whom she was waiting perhaps. The girl is now walking to and fro talking on the phone. What could be done here?
Give as many examples as possible. And its in India if that matters with opening.

I'm in college too and am practising my cold approaches, since I only ever open in class.

I've used opinion openers just twice on two different 2-sets (HB7-9s). Try making an opinion opener about something that would interest them, like if they think Drake is really a good rapper/do girls really think the guys from twilight are hot?/Would you ever date someone that was controlling? Etc etc...

after their opinion I either use C&F replies or a neg on the 9s. Then I go into a related story involving my friends to DHV.

The first set slowed after post A2 fluff talk and I just ejected, the second set I #closed an 8 and her friend who gave me EC before I even approached. I'm not that great at isolating quickly yet so after a little qualifying I told them about a part crew I knew that throws parties and asked if they wanted to check it out. Didn't do much comfort building tho.

Campus approaches can be intimidating, especially with all the thugs at my school that stare at all these girls, because they'll notice people that go up and approach girls and might see you crash n burn.