There is certain eligibility criteria for entering best engineering & IT colleges, one of which are entrance tests. CAT being one of the highest opted tests & have a lot of credibility. Know more. Common Admission Test commonly known as CAT is a national level MBA entrance exam conducted by IIMs. The admission test is taken as a entrance criteria by over 150 B-schools in India, admissions happen on basis of CAT scores. CAT is a computer based test and is conducted online. It is a pre-requisite test for students pursuing their post graduation degree.