Yes, it is possible to cancel admission after completing the first year in PUMBA if you score well in the next year's MBA CET exam. However, if you choose to do so, you will have to repeat the first year of the MMS course at a different college if you decide to take admission in another institute. Your earlier allotment or CAP participation will not be considered in any way for the new MMS course. It is important to note that you will have to justify the one-year gap or the first year of MMS at a different college during your summer and final placement interviews. This scenario is not uncommon, as many students take admission in a particular institute due to unpredictability in the entrance exam results.