Genisys 2:3 And God blessed the seventh day, and sanctified it: because that in it he had rested from all his work which God created and made. Exodus 20:8 Remember the sabbath day, to keep it holy. This is why the name "Sabbath" school.
Weekly lessons can be downloaded at https://absg.adventist.org/
These are links to current Sabbath School studies online
Another companion to the Sabbath school lessons is from Amazing Facts
Come and Reason Ministries