[chongli]

There are plenty of kids in the US who can't afford to bring lunch to school, let alone pay $20 for a SAT prep book. Many of these kids don't have a computer or Internet access at home for that matter, so Khan Academy isn't much good to them either. When we talk about rich vs poor kids, there's a HUGE gap that many people don't realize.

[banachtarski]

Anecdote: When I was younger, I used to take a public bus to a local bookstore and work through the SAT practice books (on separate scrap paper of course).

[chongli]

It sounds like you didn't have to pick up younger siblings at school when you were younger. That's the reality for a lot of poor kids. Raised by a single parent, the older siblings are in charge of looking after the younger ones. The parent often does not get home from work until late (and may have multiple jobs).

[banachtarski]

I did actually. I was the oldest of three.

I'm not saying the poor aren't disadvantaged. It's just that the disadvantages are more along the lines of attitudes towards education in the first place (along with everything else). There are also fewer people nearby that serve as an "example" on how to learn or get ahead.

[convivialdingo]

I don’t think that gap is huge in terms of internet access - there’s certainly a gap but it’s mostly a function of parents limiting access in my experience.

84% of teens have smartphones in the US. A large percentage of that remaining 16% have access to internet at school, as 98% of schools have broadband internet.

[pishpash]

They have public libraries with both computers and books. Access has never been the issue if there is the will.