Dear aspirant,

There's nothing for sure about the cutoff of a seat in particular year of a particular state. As it depends on the toughness of the paper. Depending on that the cutoff varies. For an EBC single girl child, you should score a minimum of 530-540 to be sure of a government MBBS seat in Bihar. Just to be sure, target more than 550. It will surely get you a good seat in a good college. For more details please check this;

https://medicine.careers360.com/articles/neet-cutoff-bihar

Hope this helps and all the best!