Ardony,
Its hard to exactly say if you will pass the exam while averaging 70% in the simulators, but I would venture to say its more unlikely. We believe that an 80% average or higher in the exam simulator should be sufficient to get you across the finish line with a pass. Keep striving for that.
As for the ITTOs, like Cornelius says, don't spend too much time trying to memorize them. You are far more likely to have success by looking at the flow charts in front of each process to see how they all integrate together. Try it out, especially with the Integration knowledge area.
- Steven