Dear Thilak, there are 20 IIMs and each has its own selection process.Because CAT exam will be held at different slots, CAT scores will be normalised to ensure equivalence in the difficulty levels of the exams for both slots. IIM Kozikhode will normalise the CAT scores using percentile equivalence. Adjustment of location and scale differences of score distributions across different norms and then scores will be normalised. The 20 IIMS and all the Participating Institutions will announce their Cut offs. The cut off is prepared after checking various factors. MBA aspirants will have to apply separately to all the Colleges that accept CAT scores. While CAT score remains the main criteria for selection, IIMs also consider other factors like previous academic performance, work experience, gender and Academic diversity. CAT exam paper can be Categorised into 3 parts:
Quantitative Ability
Verbal Ability and Reading Comprehension
Data Interpretation and Logical Reasoning
We shall enlist the admission criteria of all the 3 IIMS here:
IIM AHMEDABAD:

                                QA            DLR           VARC           Overall
General:                 70             70                 70                  80
NC-OBC/Trans:    65             65                 65                  75
SC:                          60             60                 60                  70
ST:                          50             50                 50                  60
PwD-UR,OBC,SC: 60             60                 60                  70
PwD: ST:                50             50                50                   60
At different stages of Selection process, Application rating process is included. The complete list of rating at various levels can be looked at: https://www.iima.ac.in/web/pgp/apply/domestic/admission/selection-process
   
IIM BANGALORE:
                            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 Bachelors degree for each of the candidates based on the final scores obtained by the candidate are used for the Bachelors 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.
IIM CALCUTTA:

                           QA             DLR             VRC            Over All
OPEN:               75               80                  80                  85
NC-OBC:           65               65                  70                  75
EWS:                 65               65                  70                  75
SC:                    60               60                   65                 70
ST:                    55               55                   55                  65
PWD:                55               55                   55                  65
And the final selection is based on:
CAT 2019 Score                    30
Personal Interview               48
Written Ability Test               10
Academic Diversity              04
Work Experience                   08
Total                                       100

Going by all these selection criteria if you score 99% in CAT 2019, you can get a call from these 3 IIMs. And the final selection depemds on your WAT and PI round performances.Your chances at IIM Ahmedabad are more because of their changed policy. Now  IIM A has reduced iys WAT cut offs to 65% from 70%.

Hello,

You have a pretty good chance of getting a call form the 3 top IIM of the country that is A/B/C. There is a good weightage for your board amd graduation marks. But no one can guarantee you a call from these prestigious institutes. Because there are many people applying for these colleges. You should try to get as much high percentile as you can get because a 0.01 more can give you a seat. 

But overall your chanyare good.

IIM Ahmedabad (IIMA)

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