Kumon
Daily worksheets in math, reading and English, set at each kid's own level, with a free placement test to see where they start.
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About
A Japanese study method, founded in Osaka in 1958. Kids do short daily worksheets in math, reading or English, pitched at their own level rather than their school grade, and check in with an instructor at a local center or online.
It suits kids who need a steady routine to catch up or get ahead. It does not follow the school curriculum, and parents keep the daily habit going.