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Shocking
kumon was invented in japan by a man who had a son and he had problems with maths so he gave him a booklet to answer and he somehow spread it world wide. he written the booklets by hand at first just for his son!
Math in the 6th grade is the first level of a video game. It's challenging, but after a few more levels, you realize how easy it was.
About 2 to 3 years.
It is. And remains so at higher levels as well.