• While most 15-year-old students spend part of their after-school time doing homework, the amount of time they spend on it shrank between 2003 and 2012.
• Socio-economically advantaged students and students who attend socio-economically advantaged schools tend to spend more time doing homework.
• While the amount of homework assigned is associated with mathematics performance among students and schools, other factors are more important in determining the performance of school systems as a whole.

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