Impressive! Grades and test scores are definitely up there. Your EC’s are strong but somewhat spread out. I would focus on the language side, since you seem to excel in that. IR might be a major to consider.
I don’t live in UK, so I have no idea about Cambridge or Oxford. HYPS is a reach for everyone and there are many qualified applicants that are not accepted. Cornell and Dartmouth are slightly easier for you to get into, I think. Northwestern, Carnegie Mellon, and Georgetown are low reaches.
Chance back? http://talk.collegeconfidential.com/discussion/comment/18122073/