Hello,
Congratulations! With your score you have chances of getting into top government medical college , maharahtra state as last years cutoff was 530+ for EWS category in mumbai under 85% quota.

The colleges you can get are:-

Grant Medical College and Sir JJ Group of Hospitals, Mumbai

KJ Somaiya Medical College and Research Centre, Mumbai

Terna Medical College, Navi Mumbai

With 612 NEET score your Overall Percentile will be around  99.18 - 99.68  and your NEET AIR Rank will be around 1479 - 1629

However these information is based on last years cutoff and as cutoff changes every year depending on factors like difficulty and number of candidates and recent COVID19 situation etc.

You can use careers360 college predictor to know the colleges you can get at your NEET score;- https://medicine.careers360.com/neet-college-predictor