A few of my sons friends got into Harvard, Princeton, etc. There's a few different types that get in. The Harvard kids I know go something like this:
1) Recruited athlete. SATs in the range, great extracurriculars (class president), rigorous courses, basically excels at every part of the application.
2) Family is extremely well-connected. Something like 8 family members have gone there for undergrad, law school, etc. Family donated a lot. He's still exceptionally smart, you know high SAT, great grades, the works.
3) The insanely smart/active/normal kid. Pretty close near SAT like 2380. 4.0 unweighted, close to 4.9 weighted. Worked as an intern at at lab full time over the summer. Won some huge science award. President of science club, tutor cub, chess club. Top it off the kid has a social life.
Either you have to have be insanely smart with some sort of hook, or just amazingly smart. If you're the kid of a politician, huge business tycoon, etc, you have a better chance than anybody else right off.