I have been teaching 4th and 5th graders using READ 180 for the past 3 years. Because of the success we have had, my principal wants me to use System 44 with the incoming 3rd graders who cannot read. Most are working at a 1st grade reading level. I wanted to make sure I have the correct materials to use. Could someone help me with this? What exactly should we have purchased? Thanks for your help!