dear student 

Yes you are eligible for regular degree courses

NIOS Board stands for NIOS board stands for National Institute of Open schooling

 it is an Authentic board approved by MHRD. Govt. Of Indiaand  is equivalent to CBSE, ICSE or the State Board. It is valid almost everywhere. You can opt your interest in career options.

visit NIOS official website for eligibility of certificate

http://www.nios.ac.in/

hope this helps

All the best!!!