Hello Riya, See for admission in DU B.com (Hons) math is compulsory... but can apply for normal B.com course...

Their criteria for B.com (Hons) - 12th (10+2) from recognised board or an equivalent exam from a recognised board 

Secured the required minimum aggregate marks in the best four subjects, which will include one language and three best elective subjects (not excluding mathematics and not including any vocational subject)

All the best

HI RIYA ANAND.

Yes he can get admission in Delhi university in B.com course .

but he will not be eligible for B.com (hons.) course .

ALL THE BEST

THANK YOU.