hello, give another attempt for CAT exam if you didnt get into IIM,Realise that IIM is just another institution there are many other colleges you can apply  for another management college (and there are quite a few excellent ones -  XLRI, MDI, TISS and the Schools of Management at the IITs) or join a job.

Its perfectly fine if you didnt get into the college of your dream if you are passionate about MBA you try some other college to follow your dream.

Donot take serious measures for your failures in life try to accept the truth and create best future for yourself.

here are some other best colleges for mba course you can opt for

1. FMS (Faculty of Management Studies), Delhi-
2. S.P Jain Institute of Management & Research (SPJIMR), Mumbai
3. X.L.R.I (Xavier School of Management), Jamshedpur
4. TISS (Tata Institute of Social Science), Mumbai
5. Institute of Management Technology), Ghaziabad

ALL THE BEST