Unicorn School: Team Magic by Linda Chapman
It's nearly the end of term and there are lots of fun activities to look forward to. But first all the unicorns have to take their exams. Everyone is working very hard - except for Troy. He has a much better plan. But when Willow discovers what he's up to, she's sure her friend will get into trouble. Can she help Troy before it's too late?
This is the sixth title in the Unicorn School series where young unicorns not only learn magic but how to be good and kind friends.