North and Hilliard exercises for revison

What are “exercises for revision”, as the phrase is used in the North and Hilliard book on beginning Latin composition? How is an “exercise for revision” different from other instructional exercises? What is the purpose to keep in mind while working on such exercises?

I’m doing a little North and Hilliard each day. Most of the time it’s obvious what the exercises are meant to teach.

I do’t have the book myself, but generally exercises for revision would be exercises that include a number of points from previous chapters.

Many thanks, Hylander.