Central Board Of Secondary Education [CBSE] — Not satisfied with marks;obtained in matriculation.

Sir, I got 95percent marks in my pre -board examination and I had never got beyond 90percent in my whole school career. But in (class-10) board examination I got only 57.2percent which would hamper my career. So, I'm questioning the board authority that on which ground have they given me such worst percentage which had made me very upset.
I will be highly obliged to you if you take immediate step to set enquiries and solve my problem.
School name -: G D Mission Public school (Dokra G PUR, Muzaffarapur, Bihar)
Candidate name-:SHUBHAM RAJ SINGH
Roll no-:22193819
School no-:65405
Permanent Address-: STATION ROAD MARHOWRAH, PO- MARHOWRAH, SARAN, BIHAR.PIN-:841418