Despite what others may say, the US is also a monculture. But even if you don't accept that, the argument that standardized tests are bias is bullshit. When the tests are offered to low income people, those who lack wealth but are otherwise talented reveal themselves. Standardized tests are the great equalizer.
Wealthy families may offer greater support for their offspring through private tuition and motivation to succeed, hence a better chance of becoming doctors, lawyers, CEO's, etc. Wealth buys advantage.
It pays to be born rich: Children with wealthy parents are MORE likely to be successful than intellectually gifted kids born to low-income families
''A new study has found a link between intelligence and genetics and used that metric to better understand how it affects outcomes for rich and poor families
The findings challenge traditional notions that America is a place where people succeed or fail based on their inherent merit and, or willingness to work hard
Researchers found that intellectual gifts are fairly evenly distributed among the rich and poor, however eventual success is heavily weighted in favor of the rich
Less than a quarter (24 percent) of high-potential people born to low-income fathers graduated from college, compared to 63 percent born to rich fathers
Researchers said that children raised in wealthy homes may benefit from early education interventions, better diets and parents who read to them regularly.''