The format of the show gradually changed with time, from having contestants provide written answers to be marked by the judges and scores kept on a blackboard, to a buzzer lockout system with electronic scoreboards beginning in the 1981 season.

Beginning in 2007, in cooperation with the Nation Junior Magazine, a new format was introduced, moving production from the studio to participating schools across the country.

The format was changed to accommodate a single presenter who read the questions and provided commentary, assuming a more informal style than the university instructors previously did.

From 2007, the winners received a trophy from HRH Princess Maha Chakri Sirindhorn, as well as scholarships and cash prizes.

Prior seasons offered award plaques from the Shell Company and cash prizes to the winners and runners-up.