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 5871-1:2005 (gas fires, convector heaters, fire/back boilers, heating stoves), BS 5871-2/-3 (inset live-fuel-effect / decorative fuel-effect), BS 5440-1:2008 (flueing) and BS 5440-2:2023 (ventilation); unsafe situations to IGEM/G/11 Ed 2 (ID/AR). Inputs are net. The manufacturer’s instructions always take precedence — confirm exact clearances and the editions your centre is testing to. Revision support, not a substitute for your ACS training.