Fraser discovers that Alfie never passed his Biology GCSE, so Alfie must go back to school himself to be taught by Gulliver and sit the exam with his own class. It should be the perfect opportunity to prove to Gulliver that he can motivate his class and lead by example, but Alfie decides there is only one real option: cheating. But, with the revelation that the notorious ball-breaking invigilator Mr Hewston will be overseeing the exam, it becomes clear that this is going to be a battle of wits. Meanwhile Martin Wickers is babysitting his girlfriend's dog and Fraser is organising the end-of-exam skip party.