Hi Raymond,
my first thoughts were that your results of the "mock exams" sounds good to give it a trail.
However I can really really recommend that you keep your stress level as low as possible
during the exam to avoid any delay in answering questions. Because time is the bottleneck!
So if you
feel uncertain with the ITTO you need to improve that feeling to a level
where you are comfortable with to get into a good mood during the exam.
From my point of view you need to have a really good "mindmap" in your mind about all ITTO's
and processes + how they are linked to each other to apply that easlily to the questions.
You can learn this for example with Mnemo techniques...
If you are happy with your
"feeling" you should also do at least one exam from another free sources.
For example have a look on O.Lehmanns questions:
www.project-management-prepcast.com/inde...tions-from-o-lehmann
I scored different in different tests and passing that also improved my feeling.
Than you should do the exam, because every day you postpone it you also forget knowledge
Keep in mind:
You need to make the final decision if you are ready or not.
Happy learnig and exam passing!!
Cheers
Sven