In my experience there have been three kinds of books: easy books, which I can skim and then do the exercises for, medium books, which I can read carefully one or two times and then do the exercises for, and hard books, which I need to read multiple times + take notes on to do the exercises for.
In most cases I try to do a majority of the exercises either in the sections indicated by the research guide, or, in the case where the research guide doesn’t offer any section numbers, the whole textbook.
In my experience there have been three kinds of books: easy books, which I can skim and then do the exercises for, medium books, which I can read carefully one or two times and then do the exercises for, and hard books, which I need to read multiple times + take notes on to do the exercises for.
In most cases I try to do a majority of the exercises either in the sections indicated by the research guide, or, in the case where the research guide doesn’t offer any section numbers, the whole textbook.