Central Board Of Secondary Education [CBSE] — Wrong allotment of marks (Not under cbse defined marking criteria)

I got 88% marks in class 10th but unaware of marks we get in class 11th and 12th preboard exam due to covid19 and also school not say about marks.I got only 70% marks in class 12, there is 18% margin and my jee exams also going well but I am totally depressed by board result and also can't sit in exam again because my full focus on iit jee preparation now.

We calculated my scores as per the criteria defined by CBSE, I am getting getting good score(at least 85%). We contacted out to the school principal but they are claiming that they had sent good marks but CBSE has reduced the marks by applying some modulation formula. Plz make everything transparent as this is going to effect my whole life.

I am totally scared of typing or data entry issue due to which wrong marks are recorded.
So please provide detailed marks of all the subjects that are submitted in the CBSE board for result analysis and also the statement of marks for standard 10th and 11th evaluation generated by the school.I need ur help as I can't do anything because I am a student only now.So, I have great hope to you

Kindly look into the issue as soon as possible.

Purushotam Kumar
Roll no[protected]
School-Sankalp Academy, Jhalawar(326001) Rajasthan