I wouldn't worry about that. Doing the express test should be the least of your worries when going on course. You'll literally run everywhere you go, from class to class, from class to meals, from class to the parade square. Doing a quick beep test won't be an issue for you. I'd be more worried about the long runs as a part of morning PT - if you have a foot or shin problem, they will be very difficult until you get your body sorted out.