Storylines:
Mika Grainger bullying and conclusion (although it was 3 episodes, it featured some good stuff)
The Earl Kelly storyline (most shocking TV death ever for me, I never expected Maxine to die so early in series 4 too)
Sambuca Kelly's cancer storyline
Mika, Brett, Donte and Chlo storyline(made Tom one of my favourite characters and also made him softer)
Jack's exit (even though he had all that stuff going on with the governers, he still made time for Mika who really needed support and showed that the pupils came first)
Chlo and Donte's crash
Lorna's MS and suicide
Lewis assaulting Kim
Mika's bullying
Tom and Izzie's relationship
The serial attacker storyline
Maxine's baby found in the playground
Rachel's prostitution past
Chlo running away from home
Rachel's past being exposed and the explosion
Earl shoots Maxine
Lindsay James' storyline
Sambuca's death
Christine's alcoholism
Comments
Storyline: Max Tyler trying to destroy Rachel.
Mika Grainger bullying and conclusion (although it was 3 episodes, it featured some good stuff)
The Earl Kelly storyline (most shocking TV death ever for me, I never expected Maxine to die so early in series 4 too)
Sambuca Kelly's cancer storyline
Mika, Brett, Donte and Chlo storyline(made Tom one of my favourite characters and also made him softer)
Jack's exit (even though he had all that stuff going on with the governers, he still made time for Mika who really needed support and showed that the pupils came first)
Lorna's MS and suicide
Lewis assaulting Kim
Mika's bullying
Tom and Izzie's relationship
The serial attacker storyline
Maxine's baby found in the playground
Rachel's prostitution past
Chlo running away from home
Rachel's past being exposed and the explosion
Earl shoots Maxine
Lindsay James' storyline
Sambuca's death
Christine's alcoholism
Note how only 4 of them are post Series 3...
Sambuca's cancer storyline
Lindsay James' storyline
Chlo running away from home
Cesca and Jonah's relationship
There's loads more that I can't think of right now.