Free
- Cold water, central heating, field diagnostics and CSCS site safety — free to test
- A good range of revision notes free to read in full, including gas CCN1
- Every answer fully worked and explained
Pass your plumbing & gas exams with confidence.
Full plumbing and gas ACS lessons, 4,500+ exam-style questions, mock exams and real on-site scenarios, with every answer fully worked and explained. Built for UK students and engineers.
- Trusted by 2000+ users across the UK plumbing & gas trade.
- 4,500+ questions, mock exams & scenarios
- From £8.99/mo · cancel anytime
4,500+Exam-style questions
180+Study notes & cards
21Modules covered
Every answerFully worked
Coverage
What are you working towards?
Pick your path and jump straight in. A free tier to get you going; Premium unlocks the full gas ACS depth.
Level 2 & 3
Plumbing revision
Cold & hot water, heating, drainage, the science and safe working.
Start Pass your ACSGas ACS revision
CCN1, CENWAT, CPA1 and the rest — built for your domestic gas assessments.
Start New to the tradeTrade handbook
CSCS card, your first job, the qualifications map and on-the-tools basics.
StartOr grab the field tools & calculators — gas rate, ventilation, CO/CO₂ and more — or start with the free guides on ACS modules, procedures and routes into the trade.
Study modes
Five ways in — one readiness score
Drill a topic, sit a timed mock, or let weak-spot review resurface what you keep missing — every mode ends in a fully worked answer.
- Topic drills
Work a module question by question, with the full worked answer after every pick.
- Timed mock exams
Length and pass mark mirror the real paper, so the clock never surprises you.
- Scenario practice
On-site judgement questions — what would you actually do first?
- Weak-spot review
Questions you miss come back around until they stick.
- Field tools & calculators
Gas rate, ventilation, CO/CO₂ and more — handy on the job, not just in the exam. Open the field tools
Your readiness scoreExample
72%
One number that climbs as your recall improves — so you know when you’re ready to book the real assessment.
Built on the standards you actually work to.
Every answer comes with a clear, worked explanation — grounded in the Building Regulations Approved Documents, the Water Fittings Regulations and British Standards, not someone’s best guess. No £10k “job guarantee” hype, no filler — just solid practice that gets you exam-ready.
Approved DocumentsWater Fittings RegsBS 7967
Questions, answered
What’s included for free?
A core set of modules is free to test — cold water, central heating, field diagnostics and CSCS site safety — and a good range of revision notes (including gas CCN1) are free to read in full. Premium (£8.99/mo or £43.99/yr) unlocks timed tests on every module, every note and the full gas ACS depth.
Which exams does it cover?
Plumbing at Level 2 and 3, the domestic gas ACS — CCN1, CENWAT, CPA1, CKR1, HTR1, MET1, WRAS and G3 — plus the electrical 18th Edition and CSCS site safety.
I’m new — which qualification is this for?
Mainly plumbing theory and the gas ACS assessments. If the names are a blur, the Training route maps out Level 1, 2 and 3, Diploma vs NVQ, and where ACS and Gas Safe actually fit.
New entrant or reassessment?
Both. The questions suit first-timers building up and engineers brushing off the rust before reassessment.
Ready when you are.
Free modules never need a card or an account — jump in and see how you score.
Start practising