Helping kids prepare for this sort of thing is really challenging because giving a speech in your own language is tough, but in another language is ridiculously difficult. The kids have to really put themselves out there...will they choke, will they be laughed at.
I have done this man times and I am always amazed at the kids who have limited ability and confidence, but immense desire, that join these contests. I can't help but root for them. Surprisingly, they have almost always given their best performance on the day of the contest.