Hello, Manisha Agrawal 

It will be difficult to tell that you will definitely get a government college because cut off varies from year to year depending on the basis of category home state etc 

However, 550+ is a good score for securing a government seat. 

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 can add in comment section

Thank you