Hii Varun

The eligibility criteria for applying as well as appearing for the Delhi univerity Joint Ability test is that You scoe 60% in any four subjects including maths ,english and any two which you got highest in your class 12th boards. As you are not getting 60 in maths in your boards that will make you ineligible for applying and appearing for the same . I am sorry to inform you this . There are  a number of other good central universities/colleges you can apply to in India. For more information on eligibility/entrance test/admsision procedures you can visit this link - https://bschool.careers360.com/articles/du-jat-eligibility-criteria

Hope it helps

Thanks