The DSW vids in this channel are good because they are classified into the following catergories: Pre-Primer, Primer, First Grade and Second Grade. Anyway, each category is divided into 4 or 5 parts. Each part consists of 10 words arranged alphabetically. There is a background music while the words flashes on the screen.
When you play the video you will hear a voice saying the words and obviously the pupils shall repeat it. The only downside thing is that the speaker will only say the words once but that is a minor thing because teachers and parents can rewind the video as they wish.
So if you have time to go to YT and you're looking for a good BSW video I highly recommend this one.