To be eligible for NEET, you must have passed the 12th class examination with Physics, Chemistry, Biology/Biotechnology  and English subjects individually. The minimum marks requirement varies depending on the category you belong to (General, EWS, OBC, SC, ST). You can find the latest information on the National Testing Agency (NTA) website.

NIOS (National Institute of Open Schooling) is a recognized board for secondary and senior secondary education in India. Completing your schooling through NIOS fulfills the basic "passed 12th class examination" criteria for NEET.Ensure your NIOS curriculum covered Physics, Chemistry, and Biology/Biotechnology as individual subjects. If your NIOS qualification doesn't include these specific subjects, you might not be eligible.

Having a BBA degree (Bachelor of Business Administration) doesn't affect your NEET eligibility. NEET focuses on your 12th standard education for science subjects.

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I hope it helps!