Exceptional schools seek exceptional, even extraordinary, students. What are your extraordinary achievements which set you apart from all the tens of thousands of high academic achievers? It's not enough to be valedictorian of your graduating class. Practically every applicant is. And these schools only accept 5-10% of them. And what have you done, how can you demonstrate, the kind of person you truly are - your character, personality, what you care about, how you interact with others, etc? You have to demonstrate that you are an exceptional person, talented student, who can excel in an environment of stringent academic & personal standards.
What do you have to offer? "Top student" is not enough. Number One in your graduating class at a very demanding high school/prep school is not enough. $100,000/year is not enough. What makes you stand out from the vast numbers of people who have all that - and a great deal more?