How much important is your academic background for getting into IIM-A. I have 84% in 10,12 and diploma. Now I'm studying eng (Cgpa 7.5 )
It is good that your academic record is faar better which will boost you to score good marks in the CAT entrance exam through which you can be able to take the admission in the IIM premises . Basically if you want to take the admission in IIM Ahmedabad premises then you should have the percentile which will be approx to 99 such that you have the better chances to get a call for the interview scenario.
All the best





