IIMs are responsible for conducting CAT exam every year on a rotational basis. The authority of conducting CAT exam is responsible for conducting all the activities of the exam such as the release of CAT official notification, CAT online application form, conducting the exam and declaration of results. Through CAT exam, one can aspire for admission in 20 IIMs and more than 100 management schools across the country. IIM Lucknow, IIM Calcutta, IIM Ahmedabad, and IIM Bangalore. are regarded as some of the top premier B-Schools in India..