There are approximately 5000 MBBS seats in Maharashtra. This includes both Government, Private and Deemed Universities. This number is  including seats allotted for 15% All India Counselling. Excluding, this there might be atleast 3500 and more seats available for Maharashtra State Counselling across all Categories. And this year there is no 70:30 reservation which means atleast 1500 seats might go for General Category. This is just a  rough estimate because of any Medical College gets its seat intake updated, we might not have those details yet. And regarding an All India Rank, ranks do change every year but you will need an ideal score of 500 and above for a seat in a GMC.