Hi Meenakshi! Chances are bleak to update the year of birth in the CAT application form now if you have already paid the application fee. IIM Calcutta hasn't announced the application correction window yet. In case the option is enabled, as per last year's process, only few fields were valid for correction, which were education degree, work experience, programme selected and interview cities. In case, this year the option to edit birth date/year is enabled, you can correct it. In case such option is not there, you can contact the test officials and seek solution.