Surveys show university students taught at home perform better than peers from conventional schools.

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Two million children in the US are taught by their parents or private tutors at home.

In surveys of standardised achievement tests over the past 20 years, home-schooled children on average scored about 30 percentiles above the median. And of those who went on to higher education, two-thirds earned a degree compared to just over half of their classmates.

Al Jazeera’s Tom Ackerman reports from Washington, DC.