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.

Ollie, Rob, Jas and Sid enter Battle of the Bands with tuneless Mr Malone. Lily wants her mum's boyfriend Ken to like her.

Lily decides to tell Rob she loves him, but first she's going to build him a football stadium out of lollipop sticks.

On the day Martha asks Lily for the 7p she owes her, Lily inherits a lot of money. She becomes determined to prove Martha is petty.

Lily's gut instinct tells her that fellow pupil Carla fancies Rob. Rob denies this but Lily sets out to prove her gut instinct is correct.

Snobby Ollie mocks Mr Malone's ancestry, inspiring the gang to teach him a lesson. Then Ollie discovers he's actually related to Mr Malone.

Rob enters a modelling competition and Lily is determined he will win using 'the look'. Martha practises dating.

Lily and Jas fake a falling-out to get Rob and Sid to stop arguing, while Ollie and Martha train Mr Malone to be a better teacher.

Lily plans a perfect date night to celebrate her anniversary with Rob, but her mum and Ken might ruin everything.

Lily, Martha and Ollie become prefects and the power goes to their heads.

It's Halloween and Jas goes to extreme lengths to cure Lily's many fears before her scary party, while Ollie falls in love with new girl Em.

Martha and Ollie are confident they can win the McSherman Science Prize, but they have one tricky formula to work out.

The girls follow an app promising future success, but can they resist their weaknesses?

Lily is delighted to be waitressing at Mugshotsz café, until Jas joins her. Martha is stunned to discover Ollie has a girlfriend, and Rob is upset Sid might leave Cranmede School.

Jas's lie to Lily snowballs into a charity sumo wrestling bake-off event! Martha and Ollie compete to win awards by teaching tech to pensioners, ex-punk Jonny and chatty Mazel.

Head boy Hunter has a crush. Lily, believing it's her, plots to let him down without smashing his heart to bits. Martha and Kat compete to have a statue erected of an Amazing Woman.

Lily lies to prove she is a good actor, Ollie researches to prove he is not a defective detective and Martha tries to prove to Jas that Sid has another girlfriend and telepathy doesn't exist.

For his PE module, Rob offers free personal training sessions, but things go awry when Mr Malone agrees to be his student. Meanwhile, Lily and Jas ask the universe for help.

Lily over-organises the best Valentine’s Day ever with Rob, Martha helps Ollie plan the perfect evening with Kat, Jas invents random gifts for Sid and Mr Malone needs a date.

For Mugshotsz Open Mic night, Martha and Mr Malone join forces in a bid to beat competitors Ollie, Kat and Hunter. Jas and her little 'friends' threaten Lily's hopes for big tips.

Ollie manages Mugshotsz for the day, but the power goes to his head. Meanwhile, Lily and Jas go on strike and Mr Malone and Lou are trapped.

Ollie and Rufus beat an unbeatable video game and celebrity vlogger Jam9T7 wants to know how. Lily and Jas’s mission to expose enviro-crimes leads to a surprising revelation.

Ollie has agreed to host a science radio show with Martha, but he hasn’t got round to telling Kat. Lily and Rob search for a song for them to not just love, but love love.

Selecting the right work experience gets bumpy. Lily's dream of being an actress turns into a nightmare, Ollie regrets his career choice, and Martha's indecision leads to a crisis.

Lily gets addicted to a virtual reality game, Ollie is forced to express his feelings and Martha wins a competition she didn't enter.

Can Lily have a perfect Christmas when Ollie is allergic to Christmas, Sid hates Christmas, Rob thinks Lily's presents are terrible, Jas is upset with Sid and Martha is leaving?

Determined to be head girl, Martha goes head to head with best friend Lily. Meanwhile, Ollie has a terrible dilemma to resolve.

Kat’s plan to outdo Martha backfires, while Jas and Lily help Martha and Ollie spend time apart to deal with their suppressed feelings for one another.

Jas and Lily plan to go travelling together but soon discover that they don’t share the same idea of a perfect holiday. Lily asks Martha and Ollie to help persuade Jas to back out.

Martha and Ollie face off in a legal battle to win custody of Edison, a cuddly lightbulb. Unfortunately Lily and Rufus are hopeless as their lawyers, and Kat is the presiding judge.

Lily tries to convince her friends that she is a top model, Martha gets a job in Mugshotsz and Ollie tries to be cool like Sid.

Lily’s new boyfriend Bob is so like Rob that Martha and Ollie use science to prove Lily is not over Rob, which leads to a shocking discovery. Meanwhile, Mr Malone offers terrible advice to Jas.

Lily and Martha compete to be best friends with exchange student Kesia. Meanwhile, Ollie has to write his student thesis from memory and Mr Malone tries to write a novel.

Lily’s friends are all coupled up and keep leaving her out, so she sets about trying to break up the happy couples. Meanwhile, Kat tries to teach Jas to be ruthless.

Martha and Kat use maths to create a dance track and become overnight pop stars, but they argue over their second tune. Lily gets competitive. Sid gets writer’s block.

Lily and Jas go a little crazy when Mazel changes Mugshotsz around and reveals that the café’s new online experience ‘cake cam’ has 250,000 followers.

Nothing to see here, just another normal day at Cranmede: Sid has a crisis about getting his head shaved, Jas learns to ride a boiled egg and Mr Malone betrays ThunderBun.

Martha thinks Lily might win the Hastings Prize, so tries to distract Lily by finding her a boyfriend. Meanwhile, Lily thinks Martha wants a boyfriend and decides to help her find one.

Lily is really excited about the prom, but none of her friends want to go, including Martha – which is awkward as Ollie was going to ask her out after the head pupils’ first dance.