Spears, 33, has two sons Sean Preston, 9, and Jayden James, 8, with ex-husband Kevin Federline.
"They go to a really hard school, and this week we had three hours of homework (a night). Some of it is hard for me. Next year when [Preston's] in fifth grade, he's going to be doing pre-algebra, and I'm taking classes so I know how to do it," she said.
The singer said she has kept a reward system to motivate her sons, reported People magazine.
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