Dear Akshat, CAT, XAT and IIFT are the entrance examinations for admission to MBA, PGDM courses. They are not confined to any particular specialisation. You have to choose your specialisation during your 2nd year of the course. You have to select the entrance examination based on the college that you want to join. If IIMs are your target, then you should write CAT. If it is for top B schools then it is XAT. IIFT is the entrance examination for IIFT MBA (IB) programme. So it depends on your target colleges.