Students need to participate in school's extra curricular activities as much as they can. This can give them extra points in their grades and as well as it can expose them to various events to gain confidence and exposure. I remember my nephew D who is in his senior year joined an academic group about marketing of sorts. Standing in front of his classmates as well as his teachers make him nervous. Apart from that, talking in stage with stage microphones can be pretty scary but those didn't hinder my nephew to deliver his defense and oral speech.
I'm sure he is so nervous but he knows what he is doing and studied his piece thoroughly that's why his stage freight disappeared as what he told us. He did a pretty good job and got a thumbs up from his teachers. Now, he has to wait for his grade that I know will be a good one.