Hundreds of students were again unable to appear in the computer-based Common Admission Test (CAT) on Sunday as authorities rescheduled the test to carry out repairs at the labs where computers suffered virus attack that disrupted the first day of exam.<br/><br/>CAT, being conducted through computers for a period of 10 days from 28th November to 7th December, got off to a troubled start owing to computer virus attacking 24 out of the 104 examination centres. The authorities decided not to hold the test at these affected centres.<br/><br/>Prometric, the American firm which has been entrusted with the task of conducting the tests for around 2.41 lakh candidates for admission to IIMs and a few other Business schools, said that the candidates who could not appear for the test have been notified and are currently being rescheduled within the testing period.