Hello !
Usually 500 marks is considered enough for getting into a government medical college under the ews category. But this might increase. Because cut offs vary from year to year. Till date NTA hasn't released the cut off for ews category. There are about 34000 seats for mbbs and 3000 seats for BDS in government medical college through out India. So depending upon students and the relative marks secured the cut off is decided m so scoring above 500 will be a safe score for any government medical college.
Please refer to the link given below for further details
https://medicine.careers360.com/neet-college-predictor?utm_source=google-search&utm_medium=paid&utm_campaign=neet-clgpd
Hope this helps