How much marks required for state quota in obc for this college?
Based on previous year cutoff records in order to get a MBBS seat in Indira Gandhi Institute of Medical Sciences, Sheikhpura, Patna under state quota you need to score more than 550 in NEET as an obc candidate. You can check cutoff of other medical colleges of Bihar by going through this link.
https://medicine.careers360.com/articles/neet-cutoff-bihar
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Hope it helps.