Hi David -
It's great you're able to schedule in that dedicated time to prepare! Like Michael suggested, it's a good idea to start working on your weaker areas first as this will be a great opportunity to bring those areas up to speed.
One bit of advice I would add is not to over-book yourself with studying during that "off" time. For example, if you normally work an 8-hour day, you might want to structure your study time around that same part of the day, and just treat studying as your job for the week. But be sure you keep it reasonable - take breaks, take time for meals, and don't work yourself to death. I found that I personally hit my effective limit after 4-6 hours of studying, after which I needed to close the books and switch gears for a while so I didn't lose focus and become counter-productive (your mileage may vary, of course).