Central Board Of Secondary Education [CBSE] — I'm complaining about my less marks in science subject

Got my marksheet and found that I got 44 marks in science out of 100. In which I only received 26/80 in theory. Whereas as in other subjects I got my marks in 80's out of 100. Please see to this I never received such low marks in any subjects. Hope you help me in resolving my issue.
Name : Bhumika Sharma
School : Shanti Gyan Niketan Sr. Sec. School
State: Delhi, New Delhi
Roll No. 14152532