Dear Student,
CBSE is always giving his 12 results in the marks format so that you can calculate your percentage also. Earlier they are giving the 10th result in CGPA format but that one is also closed now they will provide you the marks for every subject in each class so that you can find your percentage. And if you are thinking that because of covid they will give results in the grade format so for that CBSE haven't given any official notification about that, so just wait for the results and you will see that.
Best Of Luck!!!
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