[ViolaMum]

I think it depends in part, too on where your kids are developmentally.

For instance, I spent almost 3 years on the first level of Spelling You See with my dyslexic. We put the book away at the end of the year and picked it up again in the Fall. But when it comes to science, she's the opposite. I don't have to finish the book for her to understand and be able to move on. She is interested enough in the subject that she keeps up with the knowledge over the summer anyway

With subjects like History, we revisit each time period so I have been known to just let the end (particularly of SOTW) slide in the Spring and just focus on that end of the time period the next time we hit it. I tend to make them finish Lit books and discuss them before calling it quits for the year, but the grammar book I pick up in the next term.

In High School, I made them do at least 80% of the book and take the tests if it was a subject I taught and was giving a grade. (I have no idea if their co-op classes finish all the textbooks or not.) Most subjects we still finished, but poor History, alas, usually gets the brush off. (My favorite subject, too!)