Hi, I am confused about how to use the System 44 library. According to the trainer yesterday we use the library books with our lessons. For example on Code Lesson 8 in the Teacher's manual it says to use book 1...When I looked at book 1, I don't see how it coincides with the lessons. The book is a lexile of 240. PLEASE help me with this...I want to make sure I am using the library the way it's designed to be used.