Depends on the current CDC edition. Theres nothing that says that editions wont change from one person to the next....my buddy graduated one class ahead of me and has different cdc's then I do. My buddy that graduated has different ones as well I believe. all depends on when their issued to you.
There are six volumes in two sets. You get two volumes in your first set, then you take an EOC for that. Then you get your last four volumes then take the EOC for that.