Firstly, the NIOS 10+2 certificate is recognized by most of the colleges in India. So if you wish you can admission to most of the colleges in India (there can be few college which may not accept NIOS but this kind of colleges are very less). Apart from this, the NIOS students are eligible for the NEET and hence you can apply to any of the colleges in India which offers the admission to the course of BSc Nursing on the basis of the NEET score.

You can consider the article below for more information regarding the admission to the course of BSc Nursing through NEET-

https://medicine.careers360.com/articles/bsc-nursing-admission-through-neet

I hope this helps. Wish you a great eve!