Central Board Of Secondary Education [CBSE] — Unfair result

I am not at all satisfied with my son's marks especially in English and Maths which ge scored high marks previously and got low marks in 12th.Not at all justified results, .teachers are not supposed to play with children's future..I believe the result is not about student teacher relation, but about the performance of the student. And CBSE must know that this is the future of every child as they can secure admissions in government institutions based on their result otherwise they have to pay very huge fees and study in private colleges. Very unfair result and must find a solution for this like any revaluation option