In the 1980s, the Singaporean government decided to stop importing foreign textbooks and, instead, build the world's best math curriculum from scratch. Since that time, Singaporeans study fewer concepts with greater detail, following Bruner's guideline.

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Read the entire script here: https://docs.google.com/document/d/1-aaMBSEifE-I8v9EtzosyQ2ZujRNqYNpZboR8vQYN0Q/edit#

Sources:
Jerome Bruner
https://en.m.wikipedia.org/wiki/Jerome_Bruner

Spiral Curriculum
https://www.inquirybydesign.com/spiral-curriculum-thin-layers-of-paint-and-letting-go-of-mastery

Singapore Math
https://en.m.wikipedia.org/wiki/Singapore_math
http://dimensionsmath.com

Trends in International Mathematics and Science Study (TIMSS)
https://timss.bc.edu/
https://www.straitstimes.com/singapore/education/singapore-students-top-global-achievement-test-in-mathematics-and-science