Appearing for the CAT does not guarantee that, every student would get admission in the Indian Institutes of Management (IIM's).
CAT is the only qualifying examination for admission to postgraduate programmes in IIM's. Some of the top B-schools in India admit the students based on their CAT scores.
Note:
As per the legal requirements, 15% of the seats are reserved for Scheduled Caste (SC) and 7.5% for Scheduled Tribe (ST) candidates.
27% of seats are reserved for Other Backward Classes candidates belonging to the “non-creamy” layer (NC-OBC), Up to 10% for Economically Weaker Sections (EWS) Candidates and 5% for Persons with Benchmark Disabilities (PwD).