Because Malaysia is a dumbed down society, especially the majority.
Thanks facking god that the Chinese in Malaysia are staying as pure as possible or else their IQ will be dumbed down too. Malaysia is the only country in the world outside of "Chinese territories" that has Chinese school from kindergarten to high school.
The minority Blacks in US have higher IQ than those Blacks in African because the white society raises the Black American's IQ, thanks to the white folks.
In contrast, the lower IQ ethnic majority Malay in Malaysia will dumb down the minorities, assuming the minorities joined the ethnic Malay society, WHICH THEY DON'T OF COURSE.
Same for those in Singapore, the majority Chinese raises the IQ of the minorities in SG, and thus SG perform better than Malaysia. SG is richer than Malaysia.
And that's Social Darwinism 101 and superior culture VS inferior culture.
Racial Quotas In Malaysia: Grim Warning For America