I will just add a broad comment. The JAA/European approach is more structured and does not include an oral.
It is a mistake for pilots from this culture to underestimate the importance of the FAA oral exam. It can cover anything, and the examiner can "dig" into areas that appear to be weak--which is its purpose. One can walk into an FAA type rating with much less effort than the JAA demands, but you had better know the airplane.
For American pilots the oral is the focus during ground school, not the written tests. In practice the biggest complaint that I have heard over the years is that a ground school program did not prepare for the oral. Simply put, your ground school test results are of zero interest to the examiner.
I mention all of this because I sense that the OP is struggling with the different requirements and cultures.