If you know azipods, you know a lot more about Z-drives than most US mariners.
Most USCG questions are out of the 1950’s. You will have quite a few questions on Steam plants. The electrical will have more up to date questions, but still be behind the times. I really doubt that you will find any z-drive questions on a QMED exam, if on any USCG exam.
Have you gotten Lapware or Capt Joe’s practice questions? Once you try the questions I think you’ll see that the QMED exams are ridiculously easy.
You’ll need to learn some American terminology, especially outdated terminology that no one has used in years. You’ll need to learn how to look things up in the CFRs. A lot of the questions can be answered by looking them up, but one can often answer them without looking them up. You’ll need to learn the USCG style of exam questions. A lot of the questions are badly written; that will take some getting use to. Questions usually have four or 5 multiple choice answers. 2 or 3 of them are easy to immediately discard. 2 of them may be close or both correct, but you have to choose the one that USCG thinks is most correct. Questions that require a calculation will have a wrong answer that matches a common error that people make. There will be trick questions that test American English reading comprehension, not the technical matter that the question is about.
There will be a page or two of diagrams that some questions refer you to to find the answer. It’s worth being familiar with those diagrams.
A LOT , IF NOT MOST, OF THE QUESTIONS ON THE ACTUAL USCG EXAM WILL BE THE VERY SAME QUESTIONS THAT YOU WILL FIND IN LAPWARE, CAPT. JOE’S OR OTHER PRACTICE QUESTION SETS.
I KNOW ITS HARD TO BELIEVE, BUT UNTIL RECENTLY THE USCG PUBLISHED ALL THE QUESTIONS AND ANSWERS FOR EVERYONE TO SEE. I doubt that the have found time to add more than a few questions that have not been published b
You only need to get a 70% on the exam. You can afford to get a lot of them wrong. I think that a guy with your background would probably pass easily without studying at all. But I understand, you are type of guy that never does anything without being prepared. I suggest that you focus on the practice questions.