Stefano,
Allow me to begin with just a small correction: The percentages have changed and the numbers you have a ever so slightly off. here are the most current numbers according to The PMP Examination Content Outline:
I. Initiating 13%
II. Planning 24%
III. Executing 31%
IV. Monitoring and Controlling 25%
V. Closing 7%
Total 100%
However, this aside you are correct. The % that you are seeing in Exam 1 - Exam 8 of the simulator are indeed different. (I'm excluding Exam 9, because it contains only ITTO questions without regard to the percentages).
The reason for this is that about 6 months ago students began to tell us that some questions may be assigned to the wrong Domains. So we began a slow process of reviewing the questions and then re-assigning them to the "correct" domain. (I put "correct" in quotes here because you could always argue about which domain a question falls under).
This means that currently, we have the following average differences in the first eight exams:
Initiating +1.6%
Planning -4.2%
Executing +3.5%
M&C -1.4%
Closing +0.4%
As I said, this is an ongoing, long-term process and it is our goal to bring all the exams back to where they should be.
Until Next Time,
Cornelius Fichtner, PMP, CSM
President, OSP International LLC