What is OSM? CBSE evaluation system for Class 12 that got Delhi student 'Pakistani' label

Concerns over CBSE's On-Screen Marking (OSM) for Class 12 stem from allegations by students of mismatch in the answer sheets uploaded by the board.
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CBSE re-evaluation will be done through the OSM system only, 12th class answer sheets will be re-evaluated on the new portal.

The re-evaluation of Class 12 answer sheets for the Central Board of Secondary Education (CBSE) will be conducted using the ...