The CBSE class 12 board exam does not follow the CGPA system. In 2011, the CGPA system was implemented for class 9 and 10, but it was discontinued for class 10 a few years ago. Currently, there is no CGPA system in place for any of the board classes. The CBSE class 12 results are evaluated using the traditional percentage system.
Check the CBSE Marking Scheme Here https://school.careers360.com/boards/cbse/cbse-class-10-marking-scheme
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