If I remember correctly this method was advised in the comments of an HN article about Concrete Mathematics by Knuth et all. I used this for undergraduate texts

If I remember correctly this method was advised in the comments of an HN article about Concrete Mathematics by Knuth et all. I used this for undergraduate texts, mainly in math that I had collected over the years and never got around to reading, like Calculus (Apostol), Algebra: Chapter 0 (Aluffi), Computer Systems: A Programmer's Perspective (Bryant/O'Halloran), a 1000+ page book I flew through as I found I knew some of the material already and used the exercises to test what I had forgotten so I could re-read that material. I also discovered by doing this, subjects I thought I knew and would've skipped, I didn't actually remember correctly and other subjects I thought I didn't know, I could solve without having to read the chapter as previous exercises were helpful enough to understand the problem or I had picked up the information somewhere else. Aluffi's book also helpfully tells you which exercises require solving previous exercises.