Central Board Of Secondary Education [CBSE] — Recheck my marking allotment

Address:

No. 226 ,9th Street, Maji Ranuva Colony, Ponmalai, Trichy.

I am S. BALAJI, Roll no:[protected]
School code:- 55063..
Got only 67% in 12th, where I got 80% in 10th..
Some of my friends who got less than me in 10th, got much more marks in 12th, . Totally biased, , this leads to loss top colleges, .
I kindly request CBSE and Dharmendra pradhan ( education minister).. to solve this problem.
We are not prepared to write exams, we hardly believed that we will get good score in 12th, but It not actually happened