Through this question Tuck Ad Com would like to know that your need of Tuck is as strong as it was last time. Hence you should demonstrate your continued interest in Tuck by mentioning any meetings you have had with alumni/ professors/ad com, or any information session you have attended. Tuck wants its applicants to tell them how they have enhanced their application since they applied last time. You may answer this by focusing on the areas you have improved upon since you applied last. Whether you have taken extra classes, received a promotion, led a new and exciting project, increased your community involvement, or taken on a personal challenge, the key here is to demonstrate that you are now a better and stronger candidate. Your conscious efforts to strengthen your profile and to work on your weak areas will prove how determined you are about your Tuck MBA.