Can anyone explain how the old Wordly Wise levels compare to the new levels? I got a few things from a used book sale - and I want to start using them over the summer but I want to be sure I have everything I need. Book B (the old series??) seems to be just a workbook. Should there be anything else with this? I also have the teacher's guide and the huge picture cards for Level 1. I think I still need to get the student book, right? There doesn't seem to be any info. about the older A-B-C books that I can find. Does anyone use this? Can someone please guide me to make sure I don't need anything else?? Thanks!!!