Indian Institute of Management is definitely a top notch Institute for Management courses. So scoring at least 99 percentile in CAT can fetch you a seat in top IIMs such as Ahmedabad, Bangalore, Calcutta etc. And IIMs are not only the Institutes offering MBA, there are a long list of renowned colleges that accept CAT Score for admission to MBA/PGDM. Now if you couldn't make it in any of the IIMs, then you can go for Faculty of Management Studies, Delhi University, SPJIMR Mumbai, TA Pai Management Institute Manipal, Institute of Management Technology Ghaziabad, International Management Institute Delhi, IBS Business School Hyderabad, Prin LN Welingkar Institute of Management Development and Research Mumbai, IFIM Business School and many more. There are a lot of top colleges offering MBa through CAT and they have excellent placements as well and this is why these Business Schools are ranked at top of the table. You can check other colleges here
http://bschool.careers360.com/colleges/ranking/2018/top-mba-colleges-in-India-accepting-cat-score