hello aspirant,

i hope that you are doing absolutely great.

With reference to your above mentioned query, i would like to tell you that YES, you can apply for DUET Exams even if you have cleared your mathematics exam through NIOS and Class 12th from CBSE Board. Y ou can take admission in DU with NIOS marksheet .

Students who have completed class 12th from National Institute of Open Learning are surely eligible to take admission in regular college of DU. This is simply because NIOS is a recognized board.

further,  students who have studied in NIOS are eligible to apply and study in DU. Just not in DU, they are eligible for admissions in all private colleges/institutions.

I hope that this will help.