Dear Rahul, there are 20 IIMS and each IIM has a different admission criteria. While the basic eligibility criteria remains 50% aggregate for General Category in Graduation, its 45% for Reserved Categories or equivalent CGPA from any recognised University. The admission criteria of each IIM is independant to mandate their own eligibility criteria including CAT score, accademic cut offs, past academic performance, relevant work experience, etc. Selection of Candidates for Institutions accepting CAT scores depends upon the Institution you are interested in. The basic step is to check your CAT score and few Institutions conduct further rounds like Written Ability Test, Group Discussion and Personal Interview. The weightage will be given to both the procedures while selecting a Candidate. Candidates will mostly be shortlisted based on their CAT scores. 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.
IIM Ahmedabad, IIM Calcutta and IIM Bangalore conduct their admission process separately.
The newly established IIMs follow a Common Admission Process which is also called CAP. The shortlisted candidates will have to appear for a Common Written Ability Test and Personal Interview Rounds. A separate Institute wise merit list will be prepared and this merit list will be declared based on individual admission and selection criteria.
IIM Sirmaur, IIM Jammu, IIM Nagpur will release their own merit list according to the CAT score or percentile and profile of the Candidate. There are no further rounds for these Institutions.
The B schools which do not fall under IIMs will conduct their own selection process. The process of selection such as Group Discussion, Written Ability Test and Personal Interview are conducted at the Institution's discretion.
IMT Ghaziabad, MICA conduct group activity or group exercise instead of group discussion. Some Institutioms also conduct Written Ability Test and Personal Interviews after Group Discussion.
Required percentiles:

• FMS, Delhi needs 95 percentile.

• IIM Shillong: 92 percentile

• NITIE Mumbai: 91 percentile

• IIM Bangalore, IIM Calcutta, IIM Lucknow, IIM Indore, IIM Kozhikode, IIM Tiruchirapalli, MDI Gurgaon, IIM Udaipur, IIM Rohtak, IIM Ranchi, IIM Kashipur, IIM Raipur, IMT Ghaziabad, IMI New Delhi, XIM Bhubaneshwar and New IIMS need 90 percentile.

For ex;  IIM Khozikhode Admission Criteria for 2019- 21; Shortlisting criteria:

• CAT Overall Index Score carried 75% weightage

• Class 12 percentage carried 7.5% weightage

• Graduation score carried 7.5% weightage

• Work Experience carried 5% weightage

• Academic diversity factor carried 5% weightage

Considering this, you have to do real good in your Graduation and CAT, to be eligible for IIMS. If you can do so, you can pull it off.

The following steps are required to be completed to obtain CAT 2018 Non-IIM Membership for use of CAT scores by Non-IIM Institutions : Step 1 : Downloading of MOU and the Application Form. Step 2 : Payment of Annual Fees and Mode of Payment  Please refer to Point Nos 11, 12 and 13 in the MOU for details.

Feel free to comment if you have any doubt
Good luck

Dear student,
As per your query just go with option 1
New registeration to get registered yourself for cat 2019

Option 2 is for Registered Candidate login

And
Option 3 is for institute to register themselves for accepting cat 2019 score.
Option 3 is not for students

Goodluck

To be honest, your marks are a little less. However, what is in your favour is that there are 20 IIMs in India.And all the 20 IIMs have their own Selection Criteria.Now your 10th, 12th and Graduation marks carry a weightage of 5-7.5% depending on the IIM you are interested in. Few IIMs like IIM Ahmedabad, Bangalore, Calcutta, Indore, Lucknow, etc conduct Written Ability Test, Personal Interview and then the Final Selection Process follows. The basic eligibility criteria remains the same but off late IIMs have been giving Sectional weightage to CAT composite score. For example;
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
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             50
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
IIM Indore:
                                 QA          DLR         VARC         Overall
General                    80           80               80               90
NC-OBC                   70            70              70                80
SC                             55            55              55                60
ST                             45             45              45               50
PwD                         45             45             45                 50
IIM Lucknow:
                                      QA         DLR       VARC         Overall
General                        85            85          85                 90
NC-OBC                       77            77          77                  82
SC                                55            55           55                 70
ST                                50            50            50                  65
PwD                            50            50            50                  65
Method of scoring can be found on the official website of the IIMs you are interested in. Those candidates who are eligible after these 2 rounds are called for Written Ability and Personal Interview Test. The final score is calculated based on this scale for IIM Lucknow:
Common Admission Test: 30
Academic Performance (12th + Graduation): 5+5
Diversity Factor (DF academics +DF gender): 5
Work Experience: 5
Writing Ability Test: 10
Personal Interview: 40
Final Score: 100
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. These scores will be then converted into percentiles for shortlisting and selection purposes. So to be honest wih you, if you can manage a 99 percentile score in CAT, you will be able to pull off a feat and manage to get a call from any of the IIMs. Having said that, I alsp want to bring to your attention, the selection process of the IIMs so that your preparation can be target based:
IIM Ahmedabad, IIM Calcutta and IIM Bangalore conduct their admission process separately having their own weightage for Academic section, Work experience, Diversity factor, etc. You can check their selection criteria in detail at:
www.careers360.com/question-i-got-98-in-10th-8983-in-12th-87-cgpa-in-graduation-if-i-get-above-99-percentile-in-cat-can-i-get-a-call-from-iim-abc
The newly established IIMs follow a Common Admission Process which is also called CAP. The shortlisted candidates will have to appear for a Common Written Ability Test and Personal Interview Rounds. A separate Institute wise merit list will be prepared and this merit list will be declared based on individual admission and selection criteria.
IIM Sirmaur, IIM Jammu, IIM Nagpur will release their own merit list according to the CAT score or percentile and profile of the Candidate. There are no further rounds for these Institutions
But other Top B Schools and Other Participating Institutions release their cut offs post the declaration of CAT scores.

Help Ashutosh,
Dear, minimum percentage required for IIM according to the latest updates is 55%. As these marks are required for shortlisting candidates and that's why weightage is given to candidates who secured above 55% marks.
So you didn't get that weightage marks.
Good luck

Hey Mohit !
As far as all IIMs are concerned, A,B and C receive the best placements of all. But that doesn't mean that the ones lagging a bit behind A,B and C are not good or placements aren't fruitful.
After A,B and C comes IIM Kozhikode, IIM Lucknow and IIM Indore.
And none of them can produce a harsh career ahead.
Doing a degree from any of the following can be worth a life.

Hope this helps.

Good Luck !