Central Board Of Secondary Education [CBSE] — Wrong marks have been given in 10th Board Exam to my Daughter Sameeksha Tiwari

Hello Sir,
My daughter namely Sameeksha Tiwari, Class 10th, Roll No. 23258170 and her School No. 70026, in Pre Board Exams she gets 86% marks but in final board exams she get only 68% marks even in Maths gets only 44 marks how it can be possible, this will discourage her and in others subjects she did not get better marks, please do the needful.
Thanks
Regards.
M.P. Tiwari,
Addl. Private Secretary,
High Court, Allahabad
Note copy of pre board exam result is enclosed herewith