Same here. I started in late April, and tomorrow is my exam. The real time I actually spent on GMAT is shorter than 4 month, 'cause I still take at least 4-5 days off every month to be with the family, plus the time that was wandered away. Sometime you are just not in the right mode.
I feel the same thing as upstairs. I have been never been busy like this at work since the beginning of this year. Usually I will take an hour nap after coming home from work. And then study till 1 or 2. This way I won't feel too tired to concentrate. But that will probably disturb your sleep habits a little bit. And will be more difficult to implement if you have family. It makes me head heavier and makes me more anxious in the daytime, but this is the only way for me to find enough time to study. Make full use of your weekend.
Anyway, Hope I can do it tomorrow so that I won't take it again.