ACS Gas Exam Revision — Practise CCN1 & Domestic Gas Questions
Revise to pass your ACS assessment with original multiple-choice practice mapped to current Matters of Gas Safety criteria. Start free, study by topic, review every explanation and track progress across CCN1, CPA1 and domestic appliance routes.
Cycle
Focused revision for the competence areas you actually hold or plan to add
ACS is not one universal online exam. Candidates demonstrate knowledge and practical competence for a core area and the appliance, fuel and premises categories relevant to their work.
Practise with structured multiple-choice questions mapped to published competence areas. Start with CCN1 (including CPA1 combustion-performance criteria where your centre presents it that way), then add high-demand appliance routes such as CENWAT, CKR1, HTR1 and MET1 — plus DAH1 where relevant to your booking.
Study Modes
Choose how you want to revise for ACS gas assessments
Practice Quizzes
Answer short sets by topic or competence area and read the explanation immediately after each response.
Start PractisingFlash Cards
Review definitions, duties, sequences, symbols and appliance categories in compact recall sessions.
Open Flash CardsMock Exams
Complete timed diagnostic mock exams that sample your selected syllabus. They are independent practice papers, not replicas of a live ACS assessment.
Take a Free Mock ExamProgress Tracking
See accuracy, attempts and weak topics across CCN1 and domestic appliances without fabricated pass predictions.
View ResultsLive Competence Coverage
Subject and route names are pulled from the live ACS question bank so your revision stays aligned to the content available on the platform.
Browse RoutesStudy Hub
Understand assessment routes, prerequisites, competence combinations, revision order and the sources used to maintain the question bank.
Visit Study HubRevision that respects the safety-critical nature of gas work
Built Around Real Competence Boundaries
The platform is designed to help you recall principles and spot knowledge gaps while keeping live-work decisions with current standards, manufacturer instructions and competent supervision. Core, dwelling and appliance competencies stay separated so one certificate is never mistaken for universal permission to work.
Current criteria, visible dates
Questions are mapped to named SSB criteria issues and withdrawn automatically when a review date or standards transition is reached.
Explanations, not answer letters
Every scored item explains the governing principle and why distractors are unsafe, incomplete or outside scope.
No official-content pretence
The site does not publish live questions, reconstructed papers, accreditation badges, pass guarantees or unverified claims.
Revise to pass — find weak areas before assessment day
Start with a free ACS gas practice set, then build a revision plan around the CCN1, CPA1 or appliance topics that need more work — whether you are a new entrant or returning for five-yearly reassessment.