A lot of extracurriculars.
Took the SAT IIs.
Did well on my SATs. Made myself stand out in my essays so I didn't seem like everyone else in the application process.
I simply applied. I would recommend going to an elite prep school or simply having parents wealthy enough to donate large sums to the school. Then again, you might just happen to get in.
If you wish to further your education, consider one of the many options available through online degrees. Browse a wide range of online college and university programs and find the perfect degree for you.