I don't think there's anything wrong with attending an elite private high school or being wealthy enough to live in a great school district, but the rate feels surreal to me. The thing that really surprised me when I looked at the data is how heavily top companies recruit from top schools and then how heavily top schools "recruit from" high income families.
The median student at a top school is > p90 parental income and even at a "merely good" school, the median student is > p80.
BTW, I consider myself extremely lucky to have grown up in the U.S., but poor enough that I have crooked teeth, lightheaded from hunger often enough that I had standard strategies for dealing with it, malnourished enough that I once broke my collarbone from from gently rolling off the couch onto the floor, in an abusive home where I was regularly beaten, etc.
I definitely had better opportunities than the p99 person in Vietnam and likely even p99.9.