hi,

see government medical colleges has reservation for 85% seats for domicile candidates. so candidates who belongs to that particular state and fulfill the all the eligibility criteria along with marks of 12th course, age limit , has passed 12th exam from a recognized education board and eligible to apply. so even if you have studied from NIOS board you are eligible to 85% seat quota of  the state government medical colleges.

State counseling for state quota seats (85%) & private colleges including Management quota seats will be conducted through state counseling authority.

hope it would help.