My son gets into the Science Bowl team in his school, which is very surprising to me. He had not read any books additional to his school textbook, and I don't think he even spent much time on his own textbook.
He is in middle-school now and typically only 8th graders make the team.
I know there are so many super-parents with super-kids in this forum. Are there any books/web sites/tutoring he can use?