CBSE 12th

As per your past academic record, your probable standing are as follows:
1. For class 10th, your score is 2 out of 10
2. For class 12th, your score is 2 out of 10
3. For Bachelor's degree (if Science) your score is 10 out of 10
So, Application rating (AR)= 2+2+10=14 out of 30
The shortlisting of candidates or call from IIMA for AWT and PI will be done on the basis of your composite score= 0.3 (Normalised AR score) + 0.7 (Normalised overall score in CAT-2018). The upper limit of candidates those will be shortlisted in your category is 57. The Normalized AR score of an applicant is equal to their AR score divided by average of the top 50 AR scores from the applicant's pool, (the applicants pool in this case being defined as the group of candidates who appear for CAT-2018 and apply to IIMA.)
So, in my opinion your composite score is quite good because of performance in graduation and CAT Hence you have a good chance of IIMA call. Good Luck.

JB, The required percentile for IIM at individual sections i. e (PVRC, PDILR, PQA and PT) level are 70 for each and 80 overall for general category.
The academic qualifications at IIMs scores are calculated as under :-
1. Application rating (AR) for 10th class is calculated according to percent marks as follows :-
Percent score in 10th Std. Exam Rating Score A
Less than or =55 1
More than 55 but less than or= 60 2
More than 60 but less than or= 70 3
More than 70 but less than or= 80 5
More than 80 but less than or= 90 8
Above 90 10
2. Rating Scores for the 12th Std. Examination (Rating Score B) is calculated as follows
Percent score in 12th Std. Exam Rating Score B
Less than or =55 1
More than 55 but less than or= 60 2
More than 60 but less than or= 70 3
More than 70 but less than or= 80 5
More than 80 but less than or= 90 8
Above 90 10
3. Rating Scores for the Bachelors Degree Examination (Rating Score C) is calculated as follows
Percent score in Bachelor degree Exam Rating Score B
Less than or =55 1
More than 55 but less than or= 60 2
More than 60 but less than or= 62 3
More than 62 but less than or= 65 5
More than 65 but less than or= 70 8
Above 70 10
With the help of above Normalized AR score is calculated as : AR of applicant is divided by average of top 50 AR score from the applicant pool.
Composite score =0.3 (Normalized AR score) + 0.7 (Normalized overall score in CAT-2018)
The final selection score is calculated as following :- The FCS of a candidate who appears in AWT & PI will be computed as follows:
FCS = 0.50 (Normalized PI Score) + 0.10 (Normalized AWT Score) + 0.40 (CS).
The normalized PI and AWT scores of a candidate are their scores in the respective field divided by the average of the top 1% scores in the same field respectively.