For instructors
Free Gas Safe ACS Practice for Your Class
200 Gas Safe ACS practice questions with explanations, set as class practice in a minute. You see every student's progress and what the class keeps missing.
Create a free Gas Safe ACS classOr see the Gas Safe ACS practice test first.
How a class works
Step 1
Make the class
Sign in, pick Gas Safe ACS and name the class. It takes under a minute.
Step 2
Post one link
Put the class link in your LMS, a slide or a group chat. Students join with just the name you know them by.
Step 3
See what to reteach
Open the class page for scores, who practiced, and the topics and questions the class misses most.
What your students practice
The ACS CCN1 assessment is the core domestic gas safety assessment of the Nationally Accredited Certification Scheme. Gas engineers in Great Britain who want to join Gas Safe Register show their competence by a recognised qualification or by passing CCN1 plus the appliance assessments they need at a UKAS-accredited certification body's assessment centre. Assessments combine practical tasks and theory, and certificates are renewed every five years. Tigertest covers the knowledge side: the Gas Safety (Installation and Use) Regulations 1998, HSE L56, the unsafe situations procedure, combustion and carbon monoxide, ventilation, flues, tightness testing, meters and safety devices.
Tigertest's practice follows the IGEM ACS assessment pages, the CCN1 criteria (Issue 20.1) and HSE L56, checked November 2026. Students train in short sets where missed questions come back until they are mastered, then take full practice tests.
- Gas Safety Legislation
- Gas Emergency Actions
- Combustion & Gas Properties
- Carbon Monoxide
- Ventilation
- Tightness Testing & Purging
- Meters, Regulators & ECVs
- Unsafe Situations
- Gas Safety Devices & Controls
- Chimneys & Flues
- Appliance Installation
Questions teachers ask
Is the Gas Safe ACS class free?
Yes. Classes are free for teachers. A student in your class also gets that test's full stats and every step of it at no charge.
Do my students need accounts?
No. A student opens your class link, types the name you know them by and starts practicing. An account is optional and keeps their progress across devices.
What do I see as the teacher?
Who practiced and when, each student's practice test scores, the Gas Safe ACS topics the class is weakest on, and every question the class answered with how many missed it and which wrong answer they picked.
Can I use my own questions too?
Yes. Any account can turn its own material into a Tigertest quiz and limit it to one class, so only your students can play it.