is it possible to withdraw from iim indore after bba and then pursue mba from iim a or any other after cat exam?
You don't get any undergrad degree in that. The degree that you directly get is IPM. For undergrad degree you have to give IGNOU exams. That is optional and people write that exam only if they want an undergrad degree. So, if you want to drop after 3rd year you need to sit for IGNOU exams and get that degree before you can apply for CAT.