Revenge of the teacher's pets

The Brewster triplets Dawn Darby and Delaney are looking forward to a smooth transition to seventh grade but from the beginning things go wrong: they are split into separate classes they end up on the cheer squad (which only Delaney likes) Darby is failing and Dawn keeps getting into trouble--and somehow they must solve all these problems help plan their older sister's wedding and stay together despite the changes that come with growing up.