The practical papers reward the same skills every year: a clean results table, a well-drawn graph, honest uncertainties and a sharp evaluation. Each trainer below gives you fresh data, marks you the way an examiner would and shows you how to fix what went wrong. All three sciences are live. Use the panel to choose a subject, a level and the kind of practice: hands-on workouts built like real past-paper questions, or skill trainers for one skill at a time.
New trainers are added every week. The marking follows the conventions in published Cambridge mark schemes; the experiments, data and wording are our own.