Get a 1500-1600 on the Sat' s, this is key to this system working. I got a 1400 without studying, and the courses that prepare you for SAT's typically boost your score by 100 points. So a 1500 is not impossible.
If you were a C student in High School don't fret. Your dreams can come true, there is a secret. Go to a community college in the same state as the Ivy league school you want to get in to (i.e. Boston Community College would be a good example for those that want to go to Harvard).
Get straight A's for the 2 years that you are in the community college.
Excell in sports such as Crew, Fencing and Chess. They are appreciated by these schools. This is key for scholorships, but don't count on that; with your grades your lucky to get in.