Hi
Ergenekon,
I can't fully comprehend the difference between the CR questions in the GMAT prep and exam pack 1 because I never took the latter. But I honestly felt at home with CR and during the test, it was straightforward. There were no surprise question types and they generally revolved around, strengthen, weaken, assumption, evaluate the argument, bold face, etc. Moreover, I approached CR with the same method, a combination of Kaplan's and Manhattan's. I read the question stem first, and tried to identify the role of each sentence, e.g., conclusion, evidence, counter point, etc. Also, I never directly picked an answer. I always eliminated choices until I ended up with one.
I'm guessing that you might not have been exposed to all the question types or maybe the ones that confuse you are phrased awkwardly to make them seem like they belong to a new question type. I've encountered really confusing question stems but after breaking them down, I always knew which category they fell under. One more thing,I never moved on to reading the paragraph without first understanding the what the question was asking.
Hopefully this helps and thanks for reading my debrief.