Hello,

They provide dual degree program to some selected students. For IIM calcutta:- the process is selection through CAT/GMAT score. Then going through other screening tests. If you qualify then  you will get an admission. The process will be same for all the IIMs but may be the cutoff mark will vary with respect to campus location.

New IIMs are worth joining as said by the students who joined and they had a good experience there and they adventured many new things. Fee structure and hostel facilities are also good.

For more details you can check the dual degree program in IIM webpage. For IIM calcutta :- https://www.iimcal.ac.in/programs/pgp/double-degree-program/double-degree-program

Hope it helps!