Salaj, No, there is no requirement of Maths as a subject in class 12th in order to be eligible for admission the B.Com Honours course at Doon University, Dehradun. You can also apply and get admission, if selected, to the university even if you have not studied maths at the 10+2 level. The eligibility criteria is a set of guidelines which are necessary to be fulfilled in order to be eligible for admission to any college and in case of B.Com Honours at Doon University, the eligibility criteria is that the candidate should have passed the class 12th or 10+2 examination in any subject from a recognised educational board.

Hence, Mathematics is not necessary in class 12th in order to be eligible for B.Com (H) at Doon University, Dehradun.