The truth of the matter is that the exam uses a "question bank". You might think it doesn't matter but it really does. During the actual exam, questions are chosen from a "word bank" from the database - it's not human-created like how it was in the past. In the past, you can tell someone actually took the time to design the type of questions that appeared. You might get a few questions on each topic area and topic areas were evenly distributed. If there was a really hard type question on fluids, an easier question was right after it. Sort of like a give and take.
However, now, since it's a computer pulling from of database, it's dumb. There is no rhyme or reason to the organization of the questions. So this means that any topic on your specific discipline is fair game. The questions are completely random. You can potentially get 7 questions in a row about fluids, or completely separate topic areas each time. The difficulty of the questions can also be completely random.
This is why we stress the importance of knowing the FE Handbook like the back of your hand. Our book is designed in a specific way on purpose to simulate the actual exam conditions. You must be ready for any type of question that can pop up!