CBSE — Cbse maths class 10 board exam paper 2015 to 2016 sa2

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This year paper was very lengthy and some questions were from optional exercise and if questions from optional exercise has to be put so why it is written in the ncert book that this exercise is not from examination point of view .
and the paper was not according to marking scheme . it was just very difficult and section D was just very confusing . it cntained such question which we had never even seen before
plzz we should get linient marking and grace marks. its a request.