BB examples in CFA textbook

I understand that going through the BB examples (btw they are grey now) in the CFA textbooks are recommended. I assume we only need to look at those which have a question and a solution. Not the other BB examples. Appreciate any thoughts. Thanks

aren’t they in the book for a reason?

If they are in the book, they are testable material … so you do what you have to ?

Is this always the case? I know Schweser’s Professors notes often mentions that something is in the book but has no LOS hence it is very unlikely to be tested. That being said, my understanding that only if it is related directly to an LOS it can be tested, correct?