What are my chances of getting into Columbia or UPENN and should I retake my SATs?

I am a junior in high school.

I am in a magnet high school program that focuses on Medicine and is highly selective and you must test to get in.

I am in the top 2% and rank 6/372.

I have taken 3 AP's so far (Biology, Statistics, and Chemistry) and got a 5 on both Biology and Statistics but got a 4 on chemistry. However, I took the Chemistry SAT2 and got a 790. I am taking 3 more APs this year.

I recently took the SATs. I scored a 790 in math, a 740 in English, and a 710 in Grammar, so I got a 1530/1600 and a 2240/2400. I know for sure I could do better on the grammar, so do you think I should retake the SATs, or is there no point?

As for extracurriculars, I attend the Columbia University Science Honors Program, which is highly selective and you need to test into it. I am President and Founder of Freehold Model United Nations and I also have a state-wide position in YMCA Model UN as the Chairman of the General Assembly. I am also President of Junior Statesmen of America (JSA) in my school. I play varsity golf as well and am a recipient of the Congressional Award Gold Medal.

I volunteer at the local hospital in the Emergency Room on Sundays and am CPR and First Aid Certified, and I have already volunteered more than 400 hours. I also play piano and take salsa dance lessons in my free time.

I also founded the Diabetes Walk Team in the Medical Careers Club in my school and have served as team captain for the past two years and have singlehandedly raised more than $1000 each year and have won two awards for my efforts.

My biggest work is done in the field of research. I work in a lab with a distinguished professor at CUNY: Staten Island College and am working on my own original project studying the effects of tau proteins in alzheimer's disease.

Yes, I do a lot, but you guys should see the other kids in my school, they are equally talented and in todays day and age we must do all we can to compete. Please let me know your thoughts, if I am a little too spaced out with my interests, if I have a good chance at those two schools, and if I should retake the SATs.

I was pretty sure I could get into Yale or Harvard, but as of today when I found out my SATs, I am really upset and don't think I have a chance of getting in anymore. Please let me know your thoughts if I have any shot of getting in to Harvard or Yale?

Please let me know as soon as possible! I really need your opinion as I am considering signing up for the March SAT!!!

Thanks so much guys, sorry for the length!

Your SATs and ec are excellent.
In my opinion, I would be posting this somewhere else, such as collegeconfidential.com or speaking with your guidance counselor.

You have a chance at getting into all of the schools you've talked about. You're SATs are FINE. There is no way of predicting if you'll get into an ivy league school unless your legacy.

Harvard is known to reject class valedvictorians and give spots to kids way below him because they think he's more qualified.
You'll get into at least one of the colleges you wish for
but honestly a state college will give you the same education as yale or harvard or upenn.... for a lot less.