IIM's conduct CAT for their admission and selection process. Through CAT and in general other top management institutes are listed in the link below:

Faculty of Management Studies, University of Delhi, Delhi

Xavier School of Management, Jamshedpur

Department of Management Studies, Indian Institute of Technology, Delhi

Management Development Institute, Gurgaon

Department of Management Studies, Indian Institute of Technology, Madras

Top MBA colleges

You will get the complete list with the IIM's included and overall other management institutes as well.

Good Luck.