Why did Moze and Suzie manage to do so well in Mr. Quest's tabletop gaming club? Because unlike the other clubs, that one encouraged competition between members.
In Guide to: Career Day, one of Ned's career options is a school guidance counselor. Ned could conceivably make a great guidance counselor, what with his school survival guide—he's already giving much-needed advice to schoolkids, why not make a career out of it? Indeed, the guide itself might be part of the reason all the options suggested to him are school related.