Episode Title:Think Outside the Box Time.Episode Description:The final exams climax with a showdown between Karma and Gakushū as they tackle the last math problem, solving the volume of an atom inside a cube of a domain. Gakushū struggles to come up with complex formulae after reading the last half of the problem, but Karma discovers a simple formula after reading the first part of the problem. Following the final exams, Koro-sensei reveals that all of his students manage to land in the top fifty. After Gakushū and the rest of Class 3-A state their preference to the ideals of Class 3-E, Gakuhō takes matters into his own hands, threatening to destroy the old campus and sack Koro-sensei. In order to save the class and his job, Koro-sensei is tasked with solving five workbooks containing grenades that could hurt him, with one of those workbooks containing a real grenade.