Hi buddy, 

Thanks for your question, if you are from general category you are going to suffer a really hard time because IIM's eligibility criteria requires atleast 50% in 10th and 12th..for applying but don't be disheartened because there are many management colleges which doesn't follow this criteria.. 

Hey Aspirant,

I guess 50% is minimum marks required or equivalent CGPA in bacholers for eligiblity to appear in CAT. For getting admission into IIM-A,IIM-B you must score high percentile in CAT. So if you get 99 Percentile then yes you will surely get into IIM-Ahmedabad and other IIM as well.

Best of luck