> Comparing treament of Uighers to caste situation in India is unfair.

Absolutely, not my intention by my comment - more just recounting a similar phenomenon in a different discussion.

> India is fighting it on policy and social level

I'm not contesting that either! But of course there is still more work to be done.

> Is it measured? If not than how you know?

Affirmative action is quite well known in the United States. You can see the documents from the SFFA v. Harvard lawsuit, for instance, to see how the SAT score cutoff differs by race & ethnicity.