Test results speak for themselves. Poland performs well academically because of its human capital. It simply has better biological clay to work with than the other ethnicities that “diversify” classrooms in America and Western Europe. How else to explain not only Poland’s current performance—despite not having the financial muscle of other high achievers—but its long history of past accomplishments? The discoveries of oxygen, vitamins, and heliocentrism, along with advances in radioactivity and much else have their origins in Poland. American textbooks don’t cover these things because space is devoted to telling students about Cesar Chavez.
Not counting the “soft” categories of Peace and Literature, all of Africa has won one Nobel Prize, awarded to an Egyptian chemist who lived and worked in America. All of Latin America has five. Poland’s number is hard to pin down because of its turbulent history and shifting borders (some winners credited to Poland were ethnically German or Russian), but even under the most restrictive accounting, the number is seven: more than Africa and Latin America combined.
The Polish educational system gets great results because it educates Poles and not Somalis, Guatemalans or Bangladeshis. More here: https://www.amren.com/commentary/2017/05/notes-white-country-part-iii-poland-schools-education/