Hello

CBSE (or most boards) calculates your best 5 subjects out of 6, only if Yoga is officially considered an academic/elective subject.

Yoga is often treated as an additional subject, and boards only replace a subject if you fail in one of the first five.

If you passed all 5 core subjects, then Yoga marks will not be used to improve your percentage officially (unless your board allows it).

Check your board's policy on additional subjects replacing core ones for percentage calculation. Some colleges/universities accept the best 5 marks, including an additional subject (Yoga), so it depends on where you are applying.

If applying for college admission, contact them to see if they allow Yoga to be counted in your percentage.