St Clare's (9 Book Set)

When twins Pat and Isabel O'Sullivan finish their time at the elite school Redroofs, they expect, like their friends, to go on to the similarly elite and very expensive secondary school Ringmere. But their parents have different ideas for the twins as they find themselves attending St Clare's. Furious at their parents' decision to not send them to Ringmere, Pat and Isabel promise to be as difficult as possible at their new school...
Eventually making friends at the school, the series follows the comic capers of the twins as they play tricks on unsuspecting classmates and teachers.I