Hello,

different IITS accept different CAT scores however none of them except less than 90 atleast 

IIT B - 98.
IIT D- 90 
IIT M- 95.2 
IIT Kgp - 90 
IIT K- 92 
IIT R - 91 

however with 88.51 you can get admission into some of the good B-schools like

Xavier Institute of Management and Entrepreneurship, Bangalore

Institute of Management Studies, Banaras Hindu University, Varanasi

University Business School, Panjab University, Chandigarh

Delhi School of Management, Delhi Technical University, Delhi

Birla Institute of Technology, Mesra

DMS, NIT Trichy

hope this helps you !

all the best !