Hey,

After filling the CMAT form and cracking the examination, you are needed to fill a separate form for PUMBA college, that is made available in their official website, for getting a call from The Department of Management Sciences, PUMBA, Savitri Phule Pune University.
For more information regrading the topic please visit https://bschool.careers360.com/articles/pumba-mba#PUMBA-MBA-Application-Process-2020