Dan,
It is a very difficult prospect trying to memorize all of the ITTOs for the test, and one you will likely not succeed at. There aren't even that many questions about the ITTOs on the exam. What I can recommend is that you use the process flow charts for each process. This will show you how the inputs from one process become the outputs of another, and how they all connect. This is infinitely more useful that trying to memorize the ITTOs. As a starter, try and study the process flow charts for Project Integration Management. This is the "glue" that sticks the rest of the knowledge areas together.
-Steven