Do you cheat and peek at the ends of books? (Come on, be honest.)
I try not to. Part of the fun is the unexpected twists, turns and developments of the story.
But if a book is really wearing me down and I am struggling to finish it, I sometimes peek ahead to the ending and then decide if I want to continue. Or if a book isn’t engaging me like I’d like but I am still curious enough to know how it all comes out. But these are pretty few and far between for me.