Preparing for interviews in consulting, takes a concerted amount of effort. Not only do you need to prepare and practice your behavioral interview answers, but also students should be spending significant time practicing and preparing for case interview questions.
ManagementConsulted.com has compiled a significant video library of sample case interviews, offered by consultants from the top tier MBB firms (McKinsey, Bain, BCG). I would encourage you to study these videos, attempt the cases yourself, then see where you stack up in your answers. Experts believe that you should have at least 20 case interview practice sessions before attempting them in an interview setting. So leverage all the resources at your disposal and practice practice practice!