Hi Prakshita. Yes,  if you clear IPMAT, and also clear the interview followed by it,  you will be able to take admission in the 5 year integrated program BBA+ MBA in IIM Indore. You don't have to appear for CAT. Although if you want,  you can quit after BBA in IIM indore and opt for CAT to get into better iims. Refer the following link to know more about IPMAT.

https://bschool.careers360.com/articles/ipmat-selection-procedure