hello raja!!
with 507 marks in neet 2019 and from bihar under obc category,there is slightest chance to get mbbs or bds seat under state quota in bihar because last year cutoffs were 5-10 marks higher than your score.

dont lose hope they are based on previous years trend.cutoffs depend on many factors.lets hope that the best will happen to us.

please see the following link for cutoffs analysis in bihar :

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

Also you can use our college predictor for getting more accurate predictions :

Https://medicine.careers360.com/neet-college-predictor?icn=NEET_clgpd&ici=NEET_text-mapping

All the very best

Thank you