Hi Cecil -
Just my personal opinion, and others can of course feel free to disagree, but I think that getting quizzed on ITTOs is a good thing when you're prepping for the exam. You're correct that it's not a good use of time to memorize the tables, but it IS important to be able to recognize how the different processes connect to each other, especially when you're jumping from one process group to another. There are some subtle but important things to keep track of, and while you're not going to be asked to reproduce the entire list of ITTOs for the exam, you WILL need to be able to recognize them and understand how they all tie together. So I definitely wouldn't shy away from studying them, just don't worry too much about rote memorization, is all.
The simulator's ITTO questions are more direct and isolated than what I encountered on the exam, but I definitely felt that they helped me prepare for what I saw at the test center. Again, just my $0.02.