After you submit your application you may be able to take a couple of weeks off, relax, and reconnect with family and friends. Then, it's time to get ready for the final exam – your admissions interview.
When the interview invitations are sent out you'll only have a few weeks lead time to prepare; so you should start preparing for interviews a couple of weeks after sending in your application to ensure that you are fully prepared by interview day.
Some schools, such as Kellogg and Tuck, interview all applicants and begin interviewing before the application deadlines. If you are applying to one of these programs then you need to begin your interview preparation during your application preparation.