break the lesson down into intervals, say 15 minutes on rudiments, 15 minutes counting/technique, 15 mins working on a simple song on the kit (this will give them some kind of goal to work at), 15 minutes from the book "syncopation for the modern drummer"
you have to keep it interesting for them and if it's all just practicing rudiments on the pad they'll be bored and lose interest quickly, thats what happened to me when i was a kid.
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