Central Board Of Secondary Education [CBSE] — Complaints for less marks given by school authority

My child Anshika Yadav have scored 76% in her board examination result which was made by School Cometi (St.Xavier's School Ranjeetpur, Chilbila). This marks is much less than her last 10 year results. She had always been a ranked in her class & in class 9 she got 97% and secured 1st position in her class but in 10th result she is not even in top 15.And her marks in Unit test, Pre board 1st, Pre board 2nd are also above 95% if the result was made by the CBSE guidelines then she had scored more than what she got.

Please take strict action by giving attention towards her future.

I am attaching the letter I gave to the school authority and her class 9th mark sheet.