Ipcc study strategy

I plan to appear for the IPCC exams in May 2012. I work in a multinational company as a Team lead with a very hectic schedule. Some times I come back home not before 3:00 am in the morning. This leaves me very tired to even think of studying. I had started to study in office itself for a couple of days, but stopped purely beacuse of my lazyness. Now a days I have long meetings with too many action items for my team so all my energy goes there in closing out those. I don't want to quite my job. Can you guide me with a study plan that can help me out here.
I have literally done nothing so far. The only time free that I have is in the morning between 10:30 to 12:00. My office timings are 2:30 to 12:00. But at times get stretched to 1 or even 2 am in the night. I do have an off on Saturdays and Sundays.
I am really concerned as I want to do this course badly.