The Worst Class in the World Dares You by Joanna Nadin

Head teacher Mrs BottomleyBlunt thinks 4B is the WORST CLASS IN THE WORLD. She says school is not about footling or fiddlefaddling or FUN. It is about LEARNING and it is high time 4B tried harder to EXCEL at it. But best friends Stanley and Manjit didnt LITERALLY mean to let flying MINIBEASTS free in the classroom. And they really didnt LITERALLY mean to do a series of dares to become the Overlord of the Universe. These things just happened even though they had FOOLPROOF plans to get away with Paperback softback