B.O.Th Maths

I suggest you, mam. Ask your son among these two subjects. In which subject He is most interested. It is better to subject chosen by him because of his interest. Also what He wants to be in the future. If He wants to go In Engineering stream then better to choose maths but If He Wants to Be a Doctor then choose BIo. I want to clear one thing If he chooses maths then there are more chances of a stream after his 12th. But If He chooses Bio then this stream restricts to choose other many courses after 12th. Although In my opinion Student interest is matter what he wants to be. One more thing In many Boards Exam, there is the choice for the extra paper if it is available in Your board from which you want to do 12th then choose one paper as primary paper and another paper choose as Extra paper.