It sounds like you have to be very disciplined about your time while preparing for the Bar . . . if you really feel that you won't have the time and energy to progress or even maintain what you've built, then I would say that you may just have to adapt your fitness goals for this period . . . commit to scheduling x number of workouts per week that last x minutes, or y hours, and STICK TO IT. Whatever your goals, I think it will be about situating yourself to rebuild your fitness after you take your exam.