When Fraser discovers that Alfie didn't pass his Biology GCSE, Alfie agrees to go back to school and be taught biology by Gulliver - before sitting the exam with his own class.

While it should be the perfect opportunity to prove to Gulliver that he can motivate his class and lead by example, Alfie decides there is only one real option: cheating.

But when he discovers that the notorious, ballbreaking invigilator Mr Hewston will be overseeing the exam, it becomes clear that this will be a battle of wits.

Meanwhile Martin Wickers babysits his girlfriend's dog and Fraser organises the end-of-exam skip party.