The answer is: true.
When taking notes during a class one should strive to capture the meaning and sense of what the teacher is conveying to the students. However, if one is fortunate enough to be certain that a given topic or piece of information that is being discussed in class will be on an upcoming test, it would be foolish to rely on mere memory (since, in the long term, it can be deceiving) or any other mnemonic devices. The wisest thing would be to take careful notes on said topic or information in order to make sure that reviewing them will prepare you for the upcoming exam.