Hey.
The cut off for most of the government medical colleges in Bihar for admission under the State quota for the general  category was score of 530+ marks at least and above. Considering this you seem to have a chance of admission in a government college if you score in a range of 530+ The cut off is expected to be higher this year as the paper was easier.
You still have chances for admission. You can use the link below to see the previous year trends.

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

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