Central Board Of Secondary Education [CBSE] — Not following the formula for the result of 2021 class 12

My school as well as CBSE has not followed the formula for the calculation of my results of class 12 and have given me very poor marks .
I have got 94.3 % in class 10 (ICSE)
and around 84% in my class 12 pre board (offline) and still I am getting 74.8 % in class 12 and more low score in PCM 66.6% . with this percentage I am not able to take admission in any of the college even if I have cleared up the entrance exam.
If you apply the formula prescribed by CBSE then also my percentage is to far from which I got.
I request you to please help me.
Roll.no : 21605948
Yours sincerely
ABHINAV SHARMA