Maharashtra MBBS seats are filled through 15% All India Counselling and 85% State Counselling. The State Quota seats are filled divided into 70% Regional quota and 30% State Quota. The 70% Regional quota seats are reserved for Candidates belonging to Vidarbha, Marathwada and Rest of Maharashtra. And the Constitutional quota of Maharashtra is for Candidates belonging to SC, ST, Vimukta Jati/Denotified Tribes, NT-A,B,C,D and OBC. Now you havent mentioned your Category, Nevertheless, there are 6 MBBS Colleges in Mumbai. They are:

1. Grant Medical College
2. Seth GS Medical College
3. Lokmanya Tilak Medical College
4. Topiwala National Medical College
5. RN Cooper Medical College
6. KJ Somaiya Medical College

KJ Somaiya is a Private Medical College. You can check the cut offs of these Colleges at our page: https://medicine.careers360.com/articles/neet-cutoff-maharashtra . But to give you a fair idea, if you belong to General Category, you will need atleast 600-625 and if you belong to Reserved Categories, you will atleast need 500-550.