Hello Sir! Firstly, congratulations on your son's performance in CAT. As far as IIMs are concerned, it is difficult to get calls from the top 3 IIMs, Ahmedabad, Bangalore and Calcutta as they call candidates with 99.90+ percentile. He can expect calls from the following IIMs:

• IIM Indore
• IIM Kozhikode
• IIM Shillong
• New & recent IIMs (Ranchi, Raipur, Rohtak, Trichy, Udaipur, Kashipur, Nagpur, Bodh Gaya, Sambalpur, Sirmaur, Jammu, Visakhapatnam, Amritsar)

Apart from IIMs, there are several other private and public B-schools whose cutoff is 97-98 percentile. The list includes B-schools like MDI Gurgaon, SPJIMR Mumbai, IMI Delhi, FMS Delhi (unless they increase cutoff this year), DMS, IIT Delhi, VGSoM IIT Kharagpur etc. You may refer to the following article:

https://bschool.careers360.com/articles/which-b-schools-can-i-get-if-my-cat-percentile-between-90-and-100

Your son may use Careers360 Pathfinder tool to get estimated calls:

https://bschool.careers360.com/pathfinder/cat