Hey Subhashish, 

Integrated Program in Management Aptitude Test (IPMAT) is a national level entrance exam conducted by Indian Institute of Management Indore (IIM Indore) for providing admissions to the five- year Integrated Program in Management.

Yes, you can apply for IPMAT entrance exam as it requires minimum eligibility that you should have passed 10th & 12th examinations or equivalent exam from any recognized board with minimum 60% score for General and NC/OBC category and 55% score for SC/ST category.

And NIOS board is a one of recognized board conducted by Government of India.

For getting more information regarding IPMAT  refer this link :

https://bschool.careers360.com/exams/ipmat

Good Luck!