We have piloted these quizzes with our 2 maths groups. They are working a treat! We give them the quiz at the beginning of the topic and then sort 2 sets from the results. With these flexible groupings, we then teach the topic. A flexible approach is key as if a child struggles/excels, we move groups. At the end of the topic (the following week) we redo the tests and they children on the whole make progress.