The questions on that show don't indicate intelligence. Almost all of the things they ask are about pointless knowledge that nobody truly learns in school. What they test people with is as pointless as a crossword puzzles.
Remember, there's a difference between being smart and knowing things.
That show is SO beyond 5th grade. I was watching an episode my junior year of high school, and they asked a question that I had learned less than two weeks prior. And of course the fake 5th grader knew it. Bullshit!