As a general rule, consulting recruiters from top firms are some of the most professional and accomodating HR staff you will deal with in your career. Mostly really a pleasure to work with across firms.
That being said, whenever you have a question, shoot them an email or simply call them. The worst thing that could happen is that they won't tell you some specifics. However, everything around your application process, the format, the timelines, etc. is fair game.
Take care and all the best,