Hello Mec,

For a student to pursue B.Sc. (Hons) Mathematics in Delhi University (DU) , student must have scored 60% or more marks in mathematics.

Combination of Subjects for 'Best of Four'

An aggregate of 60% or more marks in one language from list A, Mathematics and any two subjects from list B.

Yes you need at least 45% Mark's in qualifying exam to get B.Sc mathematics honors in Delhi university.  Also you will be needing 50% marks in mathematics as per the new circular released by the Delhi university to be able to apply for mathematics honors. I wish you all the best