Hi Sayan!
You can know from previous year cut off in KMC Manipal that candidates with 490 in the 1st round, 500 marks in round 2 and then 520 marks in the mop up round were provided admission. For All India students score about 540 and for state quota 430 is a target you can look for.

For more details check here:- Kasturba Medical College, Manipal - Careers360.com

I hope it was helpful. All the best!