An unexpected response pattern is a reason to check a quiz question, not proof that it is faulty. Use a fictional example and a practical review routine.
Review each quiz question independently before learners see it. Use five checks, a worked percentage-change example and a reusable review table to spot and correct problems.
Check what prior learning can count, map evidence against current criteria and plan targeted assessment for anything still missing. Includes an editable evidence table.
A shared project does not tell you everything each learner knows. Plan individual explanations, evidence links and fair follow-up before the group starts work.