Hi,
I left out the ITTOs exam altogether. I did numerous timed/leaning quizes to test my grasp on the particular knowledge area i was testing for. Id prep up a knowledge area and then give 3-4 timed and learning quizes (20 questions each) to get a gauge of where i stood.
Id give the mock exams on weekends when i had time and breathing space. In total i gave only 2 mocks before my exam.
Mind you, the questions from the timed/learning quizes repeat in the mock exams.
Hope this helps.
Regards,
M. Faizan Khan