Why do you want to work at the firm? Why did you choose for consulting? What would you do in a certain type of situation? How do you function in a team? What are your long term objectives? Do you have any international experience?
After the personal questions (in which the interviewer asks information about your experience and motivation for consulting), you have to solve a business case interview. My advice is to prepare this case interview well, it is not impossible at all but it requires case solving techniques which you can learn online or while reading consulting prep books. The best preparation is to practice interviews with friends who are interviewing at the same time.
This is one of the worst companies i have ever seen. reason - They only think about money - most of the employees work more than 10 hours every day. - The more they grow in deloitte they need to spend more hours for office work and less for family hence most of the Sr. Managers and directors, they are divorced. - The more butter your boss the more you can grow in the company, good work does not count.