Tips for using a kids alarm clock for school
We never really trained our girls to use an alarm clock. They asked for one or our oldest started using her iPod. They are teens though.
While our pre-teen boys are usually up on time, I think we'd probably still have to make sure they were up if they were using an alarm clock. If they ever ask for one, we will show them how it works and explain what it does. Part of learning to be responsible is learning from mistakes so if after a short period of making sure they are up, they don't get up on time, they have to deal with the consequences of being late, etc.
I don't forsee our younger children needing an alarm clock.
Do your children us an alarm clock? How old were they when they started?