Singapore math vs others math from Department of Education Research Reports Percentage of 4thgrade students who reached the advanced international benchmark in mathematics Source  National Center for Education Statistics http://nces.ed.gov/timss/figure11_2.asp Trends in International Mathematics and Science Study (TIMSS) average mathematics scores of 4thgrade students Source  National Center for Education Statistics http://nces.ed.gov/timss/table11_2.asp
Programme for International Student Assessment (PISA) International mathematics score Source  http://www.oecd.org/pisa/keyfindings/PISA2012resultssnapshotVolumeIENG.pdf

Comparison
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MathSeed vs Kumon