Hello simran first of all its not a bad score at all, congratulations for ur achievement. Tbh the same case is with me i m also getting around 539 in neet 2019 , so according to ur question first of all it totally depends on your obc category that is either u r creamy layer  or of non creamy one , if u creamy layer then it might be difficult to predict that whether u will get college or not becoz the difference between general and obc creamy layer marks dont vary much its hardly about 4 to 5 marks and seeing accordingly to 2017 marks vs rank criteria the rank of urs would vary among 14k to 17k ( am not sure but predicting according to 2017 cutt offs ) but if ur in non creamy layer and ur  rank varies in this certain ratio then there are chances that you should get the college like anmch gaya, vims pawapuri or gmc bettiah in either of 1st or 2nd counselling becoz again looking at 2017 high cutt offs for EBC (NCL) in bihar was around 508 marks for 23k rank in last round counselling. 

So hoping to be the best lets see what happens just wait for the results then only u can predict something.

• Anugrah Narayan Magadh Medical College and Hospital, Gaya(531) low chance
• Government Medical College, Bettiah (519)
• Vardhman Institute of Medical Sciences, Pawapuri, Nalanda (519)
• Although cutoffs vary every year. You could use the following link for predicting colleges that you can get.
• https://medicine.careers360.com/neet-college-predictor