Ja ' mie 's storyline ends with her leaving the school after her term at Summer Heights High in the car with her mum and friend Brianna . At the very end , she stands up through the car 's sun-roof and shouts , " Public schools rock ! " Hellen ' Greg ' Gregson , aka Mr G , is Summer Heights High 's egomaniacal 37-year-old drama teacher . Mr G believes that he is an incredibly talented , well-liked teacher whose students share his intense passion for drama and performance . His narcissism places him in constant conflict with other staff members , and especially the principal . He frequently loses his temper with his students and is hostile to mentally disabled drama students because he believes they 'll damage the quality of his musical . It 's obvious that he is unaware that few of his students share his perception of his teaching abilities . He has written several musicals for the school , including '' You Ca n't Skate , Mate '' , based on the Avril Lavigne hit single " Sk8er Boi " , and '' Tsunamarama '' , based on the events of the 2004 tsunami disaster , set to the music of Bananarama , and also '' IKEA , The Musical '' . Despite being highly effeminate and stereotypical of a camp gay man , Mr G 's sexuality is never revealed during the show . Mr G has previously been featured on the Seven Network sketch series '' Big Bite ''
2004 tsunami disaster
2004 Indian Ocean earthquake and tsunami
Summer Heights High