Putting it into really simple and non-sarcastic words, IIM is not everything in life.
The list is pretty much big for the Non-IIM business schools in India:-
FMS Delhi.
JBIMS Mumbai.
ISB Hyderabad.
SP Jain Mumbai.
XLRI Jamshedpur.
IIT Mumbai.
IIFT Delhi.
MDI Gurgaon
TISS Mumbai.
NITIE Mumbai.
IIT Delhi.
SIBM Pune.
NMIMS Mumbai.
SIMSREE Mumbai.
XIM Bhubaneswar.
SCMHRD Pune.
IIT Kharagpur.
IIT Roorkee.
IIT Madras.
IIT Dhanbad.
IMT Ghaziabad.
MICA Ahmedabad.
KJ Somaiya Mumbai.
TAPMI Manipal.
SDA Bocconi Mumbai Asia center.
IRMA Anand.
Goa Institute of Management.
IMI Delhi.
FORE Delhi.
UBS Chandigarh.
SIBM Bangalore.
SIIB Pune.
MDI Murshidabad.
NMIMS Bangalore.
NMIMS Hyderabad.
Welingkar Mumbai.
LIBA Chennai.
There are so many who are not from IIMs or ISB but in top positions doing phenomenally well. There are many more even without MBAs.