Hello Roshni,
Try to have score of 475+ marks in NEET (UG) exam to get a BDS or BAMS seat in a good Government College Mumbai.
National Testing Agency (NTA) will release NEET 2020 cutoff percentile along with the release of bulletin. While the cutoff of NEET 2020 scores will be  equivalent to percentile will be announced. NEET cut off 2020 varies for each category.
Since you have not specified in which category you belong, its hard to tell you.
Hope it eases your confusion.
For further query you can message here.

Roshni, 50-60% in 10+2 from a recognized board is required to get admission in BAMS or BDS but it may vary depending on the colleges. Also, you need to qualify neet or CET exam to get admission in reputed colleges. For neet, you must secure at least 50% to keep yourself on the safe side. But marks more than 500 will surely help you to get admission in top colleges. To check out the previous years cutoffs of different colleges in Maharashtra, kindly visit our page at

https://www.google.com/amp/s/medicine.careers360.com/articles/neet-cutoff-maharashtra/amp

Good Luck