Dear Asish, all the IIMs shortlist candidates for the interview stage based on their own criteria, which may be independent of each other. The process may include Written Ability Test, Group Discussion, and Personal Interviews. Performance in the CAT examination is an important component in the admission process. IIMs may additionally use other factors such as the previous academic performance of the candidates, relevant work experience, gender and academic diversity and other similar inputs in shortlisting and ranking of candidates at various stages of the admission process. The processes, academic cut-offs and the weights allocated to the evaluation parameters may vary across IIMs. But the cut offs might look like this:

IIM                                    QA         DLR        VARC            Overall

Ahmedabad                    60           60             60                  70

Bangalore                       65           65              70                 75

Calcutta                          60           60              65                 70

Indore                            55           55               55                  60

Lucknow                        55            55             55                 70

Hello,
.
To get a call from IIMs it depends on which branch of IIM you choose.
.
Mostly top IIMs only recruit students who scores 90% in CAT examination. Where of the IIMs like Ahmadabad needs only 80%.
.
Firstly your preference will be give to CAT examination percentage and then graduation score.
Don't be worried about your graduation grades, you have a very good percentage.
You just focus on your CAT percentage. Best of luck