Hello, Amit Pandey 

It will be difficult to tell you the exact chances as cut off varies from year to year depending on home state category etc 

However 550+ you can surely get a good government college you have scored 539 you have better chance of getting a government college 

I'm providing you a link which can help you 

https://medicine.careers360.com/neet-college-predictor

Hope this helps you if you have any queries you cannot add in comment section

Thank you