Central Board Of Secondary Education [CBSE] — kannada x exam 2019

Address:

560085

I have obtained 78 marks for kannada final x exam 2019. But the grade given is d1 and not b1 as it should be when i checked on the official cbse website. I need to know whom to reach out to and get the correct grade according to the marks. My roll number is 4062152.
I need this to be resolved as this can affect my final grade. My social science grade should be a2 but is given b2. The grades should be corrected.