No. if u don't take maths as main subject you dont have to write math exam in +2 board, unless maths is compulsory or if u change your subject in +2.............
hey will yoy clarify me a little bit about it
if suppose i have taken maths as optional subject along with biology in +1 class and even doesnt change the subjects for +2, then of which subjects i will have 2 give xam in +2 board
consider me a student following CBSE pattern