Hello,
Getting a call from any IIMs depends on a lot  of factors. Although the exact weightage of each is not known but it includes: Marks scored in clasa X and XII, subject and score of graduation, work experience, CAT percentile.
So, as of now, the only thing you can work upon is your CAT percentile.
You need to have 99+ percentile for IIM Ahmedabad.
Don't worry, there have been candidates who secured below 70% marks in school and graduation and got a call from IIM A.
So, prepare hard for CAT and try to achieve 99.5+ percentile. You will  have high chances of getting a call from top IIMs.

Follow this link for more information:
https://bschool.careers360.com/exams/cat

Good luck

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