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.