Important update April 16, 2025: Since this story was first published, CISA signed a contract extension that averts a shutdown of the MITRE CVE program.
"Teachers in India openly discriminated against students from other castes/jatis/varnas by giving them lower marks."
This is a very bold statement and also looks like you are generalizing the whole Teachers strata. I have not seen or experienced a single such incident during my school/college years.