Hii,

NIOS students are eligible for NEET 2019 exam if they have passed 10+2 class with Physics, Chemistry, Biology/Biotechnology and English as major subjects in both Classes 11 and 12. The minimum aggregate marks are required 50% for UR, 45% for PwD and 40% for SC/ST/OBC category candidates. For more details regarding the eligibility criteria follow the link given below:

https://medicine.careers360.com/articles/neet-eligibility-criteria

All the Best!!!

Yes they are eligible for NEET Exams pertainin they have passed the necessary subjects like Biology, Physics, Chemistry and English in accordance to NEET Guidelines. 

Kindly refer to the NEET Prospectus 2019.