HarshChat have you taken many role based certification exams recently? People seem to assume that questions ask simple things that you can look up in the open book. That's not the case. The point of the exams is not to see if you can look up something in the documentation. Authors avoid asking questions that are purely knowlege-based. (I know that wasn't the case in the past, and that leads to people assuming that's still how it is. They have what I call "old pain").
Instead, questions are meant to require you to interpret and apply information.
The open book allows you to check values, SKUs, etc. i.e., the things that no-one should need to memorize. That's the same as if you were using the documentation as part of your work. But that should never be the entire focus of the question. If you ever see questions that are purely knowledge/memory based, you should comment on them. They should be removed.
And given you can look up the same content that you possibly learned from, you might be able to read the Learn content to work out how to answer a question. But you'd run out of time if you needed to do that for many questions.