No, the CAT (Common Admission Test) is not compulsory for admission to all MBA programs. While many prestigious business schools in India do consider CAT scores as a part of their admission criteria, there are numerous MBA programs globally that accept other standardized tests like GMAT, GRE, or have their own entrance exams and evaluation processes. It's advisable to check the specific requirements of each MBA program you're interested in to understand the standardized tests they accept and their admission criteria.