Look back at how a 3.5 UW GPA got accepted to top 20 institutions (No Hooks)

I feel like you did to be honest. I have a 3.5 uw but a 3.7 w but at the top %15-20 of my class. Georgetown, Cornell, Dartmouth, Barnard, and NYU are my dream schools. Is there any advice you can give on improving my chances rather than writing stellar essay (which I will try my best to do)?

These are my stats: http://talk.collegeconfidential.com/what-my-chances/1884190-ea-georgetown-for-fall-2017-admission.html#latest

It would be great if you could give some info on things I can realistically improve before college applications. This post gave me so much more hope about getting into my top schools.