hi Satish,
FOR IIM Ahmedabad you need a very good CAT percentile then only there is a chances of getting call. Generally engineers have hard time to get a call because they are less preferred, so if you are an engineer then you need 99.5+ percentile(to be in a safe zone), though there are some students who get call with a little lower percentile than 99.5 because of their exceptional profiles .IIMs also check your 10th, 12th, graduation percentage, work experience, UG Stream. IIM Ahmedabad gives good weightage to CAT percentile. So you can't mess up your CAT score that will reduce your chance of getting call drastically.
Hope this helps!
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