Crabtree School 1: Year Two Forever and Ever

Ava can't wait for her first day of Year 3 at Crabtree School. But there is a problem: the Year 6 class from last year are refusing to leave. Now those pesky 11-year-olds are clogging up the whole school, and Ava is going to be stuck in Year 2 forever and ever. Ava and her friends must come up with a plan to get the Year Sixes out, for good.