1) Is that actually "most" people?
2) Is the belief that it's the "most" biased?
I've heard the claim that the SAT is biased against lower SES for a while now, but more on the left than the right, and I've never heard "most" biased.
We need to intervene much much earlier than college admissions if we want to fix that. But it's a really difficult problem because cultures in low SES areas like where I grew up tend to shame and beat the shit out of smart kids, and one culture's "intervention" is another's "unwelcome interference".
I've heard the claim that the SAT is biased against lower SES for a while now, but more on the left than the right, and I've never heard "most" biased.