Hi Siddhant! Since you have an average academic background, you must aim to secure above 95 percentile in CAT 2018. IIMs give a lot of weightage on past academics, hence despite high percentile, there would be no assurance of getting IIM shortlist, especially the older IIMs like IIM Ahmedabad, Bangalore, Calcutta etc. However, you may expect calls from SPJIMR and MDI as they do not assign a heavy weightage on past acads. You may also expect calls from new IIMs with 90+ percentile.