Central Board Of Secondary Education [CBSE] — Not getting the deserving board examination marks from school

This is Noor Fatma a student of A B Ascent Public School, a 10th grader[protected]
In my board result school has made modification in my science marks.
As in preboard and earlier examination my marks in science were good . In preboard -60 out of 80 but in finul results they have gave only 40
This is totally unfair and disappointing
Have a look on it and kindly do action against it.