The CAT (Common admission test) exam is written to get into one of the most renowned colleges in india like IIMs to pursue post graduation. The minimum eligibility criteria for CAT is 50% marks in graduation. The CAT exam includes Verbal Ability & Reading Comprehension (VARC) ,Quantitative Ability (QA), Data Interpretation & Logical Reasoning (DILR) . The application fee is RS.2000 and the examination is computer based but not online. This year due to the global pandemic, the time duration of the exam has been reduced to 2 hours and even the number of questions have been reduced.
I suggest you to refer the following link for more details about CAT