Admission to IIM BANGALORE is through CAT and ypu should have completed your Bachelor's degree in any discipline with a minimum aggregate of 50% to qualify for CAT. It is 50% for General Category and 45% for Reserved Categories. Here is the selection procedure:
QA DLR VARC Overall
General: 80 80 85 90
NC-OBC: 70 70 75 80
SC: 65 65 70 75
ST: 60 60 60 70
PwD: 50 50 50 60
For all the Candidates shortlisted, the 10th and 12th board results are initially adjusted by dividing each such score by 90th percentile score of that board. And then an adjusted score is calculated for the Bachelor's degree for each of the candidates based on the final scores obtained by the candidate are used for the Bachelor's degree and professional degrees. For example,
CAT = 40
10th board = 20
12th board = 10
Bachelors = 20
Gender Diversity = 2
Work Experience = 8
The 40 points for CAT are derived from the performance in each of the three sections as follows:
Verbal & Reading Comprehension - 14 points
Data Interpretation & Logical Reasoning - 16 points Quantitative Aptitude - 10 points.

For fee structure, please read: https://www.iimb.ac.in/pgp-programme-expenses