They only interviewed 510 people. Not a statistically significant number IMO. There's no mention of demographics either other than the age range. Having said that, I don't doubt that there's a problem.

The schools aren't entirely to blame. I think a kid's home life plays a bigger role. I recall a study done on the Vietnamese "boat" people. Even though they were severely disadvantaged socially and economically their kids did better than average in school. The study attributed it to the culture at home. It's not like these kids went to better schools.

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Wake up every day that would be a start.