Ok, so you’re an international (from South Asia no less) which makes the competition extremely tough, AND you don’t have the highest GPA. Ivies and Stanford and Cal will be super tough, maybe don’t apply to ALL the ivies? That’s a lot of work.
Your EC’s are good, but nothing extraordinary to make up for the GPA.
Probably hundreds and thousands of people from South Asia apply with 4.0’s/2300+/Outstanding EC’s etc. Probably only a handful get accepted. I think that you should not expect (you can definitely hope like the rest of us 
) to get into any of the American schools listed as they are hyper-competitive (All have sub 10% admit rate for international applicants)
I think Oxford doesn’t care about grades? I think they like SAT’s and AP scores. I don’t know if they’re offered, but AP/SAT 2 are very important, so take some of those if you can.