Hello,

Yes, you can avail any scholarship available after completing 12th from NIOS.
NIOS is equivalent to all other Boards like CBSE, ICSE or any state board. The National Institute of Open Schooling (NIOS), formerly National Open School (name changed in 2002), is the board of education under the Union Government of India..
So, you can definitely apply for scholarship as a Nios candidate.

I hope this helps.