We didn't like Level C as much as we liked Level B and at times we had to put this book aside. It was a little slow and tedious at some points and we had to liven math up a bit. That being said however, there are some concepts that I just can't teach the way Joan Cotter does. I am not math minded and the concepts and tricks that she presents would never occur to me naturally nor would I be able to teach them without her scripts. Some things I can present on my own and we can explore other ways but many of her strategies are very helpful for my children so I will continue to use RightStart for these valuable lessons. We may just pick and choose lessons or skim through the next level but there are some concepts that I know I will need the Lessons book to teach.