These materials have required much precision, and I have found each part to be extremely accurate and well communicated.
The simple words come with drills that fully get the word to conceptual understanding. I have done bits and pieces of this program on my own and was greatly helped with these definitions and clarity of which they are laid out.
Before this, I was tripping over certain uses of simple words, but I now have a much-increased level of awareness and comprehension of this.