I prefer a book as it's easier to look up answers. Since most people do everything on a computer now, a database would be easier. If you learn better by visual cues, the DVD would be better.
@YGNR You are correct for physical sports, but mental sports are different. For people who participate in spelling bees, they don't repeatedly spell words, they learn root words and common spelling rules. They do practice the spelling of irregular words just as a chess player may practice a BN checkmate.
@YGNR You are correct for physical sports, but mental sports are different. For people who participate in spelling bees, they don't repeatedly spell words, they learn root words and common spelling rules. They do practice the spelling of irregular words just as a chess player may practice a BN checkmate.