Central Board Of Secondary Education [CBSE] — Too poor marks in science 62(42+20)

Respected sir/Madam
My son ANMOL Kumar Jha has always beeen a Bonafide student and has always secured more than 95percent marks in science in Dr D Y Patil School from 7th onward (7th-99, 8th-97, 9th-95 and 10th pre board-95). As per CBSE guidelines the shool has to award marks as per the marks obtained in shool exam and my son has never got so poor marks till date, But in the Board, The shool has awarded only 62 marks in science. How is it possible?
For kind reference Marks sheets of class 7th to 10th pre-board issued by school is attached herewith for your kind perusal and necessary action at your end.
So I request you kindly to review the marks of my son.
Roll No.[protected]
School Code -65666
School - Dr D Y Patil Pushapalata Patil International School, Patna
Name ANMOL Kumar Jha
Father- Deelip Kumar
Mother- Chanda Kumari