Central Board Of Secondary Education [CBSE] — Not satisfied from cbse 12th result

I am jaanvi Gupta from sant hari dass public school delhi. I got 90% in cbse 10 and 75 % in class 11 and average score in class 12 pre board .Then SHD SCHOOL say that they reconduct exams for class 11 and class 12 after decision of cbse that all reports and marks given by school . School made a mistake and change my real data . And those students who have compartment and less marks than me, that's times how they achieve 90 and 95 . I can't believe. A student who grandson of principal can't attend class11 and class 12 th pre board how school give 95 score .I request please take action to school this kind of school destroy the future..