No the only source to get into IIM Bangalore is through CAT entrance examination only. After giving the CAT entrance exam, you can get the seat through your merit score. Seats through management quota are also available but for that also you need to pass the CAT entrance examination.

Refer to the sites below for more detailed information..

https://bschool.careers360.com/exams/cat

https://www.careers360.com/university/indian-institute-of-management-bangalore

Best wishes. Thank you.