Each question gives instant feedback with an explanation, and the bar at the top tracks how far through you are. Flag any question to revisit it later in Key Revision. The quiz opens in a focused full-screen view, and questions are picked at random each time.
Figures reflect current published standards — BS 6798 (boiler installation ≤70 kW net), BS 5440-1:2008 (flues) and BS 5440-2:2023 (ventilation), BS 5546 (hot water supplies), BS 7074 (expansion vessels) and BS 7593 (water treatment), plus the Benchmark commissioning scheme; unvented hot water under Building Regs Part G. Always follow the manufacturer’s instructions and confirm the editions your centre is testing to. Revision support, not a substitute for your ACS training.