Hello Spandan,
If you are looking for admission in Bennett University and you have passed your 12th from NIOS, you can surely get an admission there as long as you have an authentic certificate, equivalent to the same as CBSE.
You do not need to be worry about its validity as NIOS board comes under the Ministry of HRD, Government of India, thus it is as valuable as regular school.
In order to get admission in Bennet University, you need to go through an online admission procedure, upon being shortlisted, you would be called for an interview, and your final selection would be done on the basis of that.
Depending on the type of field you want to pursue from Bennet University, whether it is in Law, Journalism or Science, you would need to prepare accordingly, NIOS certificate would not be a problem.
I hope I was able to help you!
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile