Congratulations!!! You have good chance of getting government college through state quota but i think you have to wait till last round.. Less chances through AIQ Councelling. Wait for your state rank, rest depends on number of seat available in your state..
ALL THE BEST!!!

Hello
Congratulations on scoring 510 in neet examination.

Based upon your score in NEET 2018, and the previous year cutoff, chances are less for admission to Government Medical Colleges under All India Quota. however  may have good enough  chances for admission to government colleges under state quota.

Use NEET College Predictor to Check Your MBBS/BDS Chances in All India Quota, Deemed Universities & State Quota seat Based on Your NEET AIR
   https://medicine.careers360.com/neet-ug-college-predictor?icn=neet-clgpd&ici=qna-answer

You can easily get into a good govt medical college in your state.
That was an excellent mark.
Hope you can find college of your choice.
All the best