With a graduation score of more than 50%, you are eligible to take the CAT and gain admission to IIM Ahmedabad. With your academic background, admission to IIM Ahmedabad is extremely difficult. With the addition of 5 points for work experience, your chances of getting may improve if you have more than 36 months of experience.
In the academic rating, you will receive the following scores:
10th grade = 2/10
12th grade=1/10.
Graduation=8/10.
To be considered for an interview with IIMA, you must have a composite score of 0.642 out of 1. You will need 0.512 out of 0.7 in CAT score with a 13/30 academic rating, which is 0.512/0.7*300=219.42 marks in CAT. If you live in Delhi and are studying for the CAT, you can be mentored by IIMA alumni.