Martha feels ignored by her workaholic mother so Jas helps her to rebel to get noticed.

Cool girl Natasha Jones invites Lily to join her group and dress in yellow on Mufti Day.

Martha is mortified when she gets a lowly A minus for her latest history assignment.

Martha's mother buys her tickets to a science talk to be given by a famous science presenter.

Jas is excited to play Juliet in assembly, but when she gets sick Ollie tries to persuade Lily to take her part.

When Lily worries that she and Matt might be incompatible, Jas adapts some school software to create a love machine.

Jas learns her favourite tree will need to be cut down to make way for the new school library.

When Lily is upset that Matt is going out with cool girl Greta Masters, Jas plans a slumber party to cheer her up.

When Mrs Lazarus suggests Martha may not have what it takes to become a human rights lawyer, a defiant Martha sets about proving her wrong.

The girls team up to enter a National Young Inventors competition, but Lily and Martha fall out when Lily leaves to join Matt's team.

When Lily loses her tie she is encouraged unwittingly to 'steal' a tie by an older pupil whom she helped out earlier.

When Lily loses her library books, she invents a fictional classmate to take the blame and soon the lie escalates way out of control.

The rest of the group are horrified when Jas signs them all up to a charity basketball tournament in an effort to impress the boy she has a crush on.

Lily is troubled because she's not sure whether she and Matt Furnish are actually going out or not. Jas volunteers to help.

Martha is worried Mr Malone is not up to teaching PSHE classes thoroughly enough and that she will fail the subject.

Jas has fallen in love with the school locusts and is tenderly looking after them.

Lily decides she must kiss Matt to prove they really are boyfriend and girlfriend. Meanwhile, Martha and Ollie research germs.

Head of school council Jade comes up with the idea of a graffiti wall at school, with pupils invited to express themselves on it.

Dressed up as boys for drama, the girls get mistaken for boys. Mrs Griggs is obsessed by a phone app game called Sweetie Swap.

When Mrs Hampton volunteers to help out at the upcoming food festival at school, Lily panics that her mother is going to embarrass her.

Martha and Lily desperately compete to avoid being top of the class as the reward event clashes with their plans.

Traditionally, Martha and Jas have had a joint birthday party. When Jas and her dad suggest 'shaking it up' a bit this year, it leads to some arguments.

When a photo of Martha in the school prospectus is photoshopped, she is outraged. Mrs Griggs's latest obsession is underwater karate.

Jas decides to follow in her dad's footsteps and try out for the junior hockey team. Mr Salford was a legendary goalie in his time at the school.

Mrs Griggs decides that a social skills class could be beneficial for certain pupils - including Martha, Rufus, Cassie and Maxwell.

Martha becomes troubled when she is the only person unable to cry in an emotional assembly. Meanwhile, Matt learns to play the guitar.

When she discovers her mum's school grades dropped the year she got her first boyfriend, Lily tries to avoid the same thing happening to her.

Lily complains Rob is too 'boy' - she finds his boisterousness and burping gross and decides to give him a dose of his own medicine.

A business studies competition is announced at school, and both Lily and Martha desperately want to be project manager.

Lily decides her bedroom is babyish and needs a makeover to reflect the fact she is now a sophisticated teen.

Jas is asked to be a bridesmaid but is worried about being too clumsy. Meanwhile, Mr Salford has to make a presentation.

Jas transforms the art room into a spaceship to conduct an experiment into how teenage boys deal with being cooped up together.

Martha starts acting oddly, getting emotional and over-reacting to things. She's horrified to realise that her hormones are kicking in.

Martha and Ollie throw Cassie and Maxwell off the maths team, desperate not to be outshone as they were last year.

Lily tells Cassie and Maxwell about Rob's inability to get angry and they resort to hypnosis to cure him.

Lily worries that Jas is feeling left out. With Ollie and Martha practically a couple as well as her and Rob, she decides Jas needs a boyfriend.

Lily is delighted when Rob buys her a present for the first time - only it's a horrible bug-shaped brooch!

When Lily and Martha get the flu, Maxwell and Cassie are roped in to replace them in the school's general knowledge quiz.

Martha is offered a place at Greatacre, the boarding school her mother once went to, but Ollie and Alfie can't cope with the idea of her leaving.