Chances of admission for UK student

<p>Hi everyone, this is my first post here so bear with me if it goes wrong:
I'm a student at a UK secondary school, looking to apply to universities in America, my top choices are: Yale, Brown, Colombia, RISD. I've had a hard time finding information as to what kind of chances UK students have to get into these schools, so if anyone could take a look at my resume and tell me what they think I would be extremely grateful :) ---
Here goes:
8 A<em>s, 3 As and one B at GCSE
AS levels- maths, further maths, art, economics, English language (all predicted A's with top scores) French (already took it, got an A, took A2 this year predicted A</em>)
SAT- 800 in math, 670 in writing, 700 in critical reading (SAT 2's not done yet)
Sports: American Football and Athletics (both at county level)
EC's : Debating society, Made a business when I was 16, Art Club, Théâtre club, Film club
Achievements: went to Africa to build a school and climb kilimanjaro when I was 16</p>

<p>Thanks a lot for your time if you read all that haha, i'd really appreciate any comments/thoughts, positive and negative, Thanks.</p>