G3 Exam Structure in Ontario: Format, Coverage and Booking
Understand Ontario G3 exam format, curriculum coverage, permitted references and booking steps, with current TSSA sources and a practical way to prepare.
Understanding the G3 exam structure starts with separating three things: the certification examination, the training curriculum, and the practice questions you use to prepare. Each has a different purpose. A course outline helps you organise coverage; a mock result helps you choose a study task; your examination instructions tell you what to expect at your sitting.
This guide was fact-checked against current TSSA pages and their linked documents on September 13, 2026. It explains what those sources confirm and where you still need a specific answer before booking or planning a timed rehearsal.
What the current examination guide confirms
TSSA's guide confirms multiple-choice Fuels questions and a 75% examination pass mark. Its question-count and time ranges span certificate types, without G3-specific figures. TSSA examination guide.
CodeSafe Canada has not verified an exact G3 question count or writing time in these documents. Confirm both for your booking; a practice product's length cannot fill that gap.
Keep the mark's purpose clear, too. A certification pass threshold is not a formula for converting a practice percentage into a probability of passing. Your practice conditions, question familiarity, and reasoning still matter.
Use the G3 curriculum as a coverage map
TSSA's training map assigns modules 1–9 to G3. They address personal safety, tools, fuel properties, rules, introductory electricity, technical documents, customer communication, piping/tubing, and appliances. The policy also treats theory and practical evaluation separately. TSSA Gas/Oil policies, sections 5, 19 and 21.
A curriculum map does not tell you how many examination questions will appear on each topic. Do not divide a guessed question total equally between the modules or treat the order of a contents page as a ranking of importance.
Make your own coverage record using the course outline you were given:
Record beside each course topic | A useful entry |
|---|---|
Material covered | The lesson or assigned reading you completed |
Understanding checked | A concept you explained without copying |
Application checked | An unfamiliar practice example you attempted |
Remaining gap | One question you need to resolve |
For instance, “technical documents reviewed” is broad. “I identified the drawing revision and explained the condition stated beside the figure” gives you a clearer record of what you can do. The table is a study worksheet, not a reconstruction of the official exam blueprint.
Use G3 module practice to work on a chosen topic. Leave enough time to compare your reasoning with the supporting lesson instead of finishing at the result screen.
Confirm which booking process applies
TSSA's live FAQ describes in-person computer-based examinations through Prometric: apply through TSSA, then follow the eligibility email to schedule. For a special sitting arranged by an employer or training provider, confirm arrangements with that organiser. TSSA examination FAQ.
Keep separate records for an application, eligibility, and an actual appointment. Label each message so that an application acknowledgement does not become the only item in your calendar.
Before planning travel, check the certificate level, candidate name, location, date, and arrival instructions in your own confirmation. If something conflicts with another message, identify the two documents when you contact the relevant organiser. A precise question is easier to resolve than a general request for exam information.
Read the permitted-materials entry carefully
The shared G2/G3 entry lists legislation, Code Adoption Documents, B149.1, B149.2, and optional B149.2S1. Bring permitted references yourself; writing and notes are prohibited, while highlighting, dividers and tabs are allowed. TSSA permitted-materials rules.
Use the actual guide to check the complete entry and the condition of permitted books, including its instructions about annotations. Do not assume a personal study summary becomes permitted simply because it contains code references. Establish the edition or document version required for your situation before buying or borrowing material.
A useful preparation exercise is to locate an assigned passage, read its conditions, and explain why it answers a classroom question. Keep that exercise separate from deciding what you may bring to the exam.
Practise the decisions the format requires
For a multiple-choice study question, write down what is being asked before comparing the options. Identify any qualifying condition and the unit requested. Then explain why your selected answer fits those details.
After checking feedback, inspect the reason for a mistake. Did you misunderstand a term, choose an unsuitable calculation, overlook a condition, or simply recognise an answer from an earlier attempt? Each observation points to a different next session.
Once a topic is clearer, combine it with less familiar material. The guide to module practice and mock exams explains how to choose that transition without treating either format as an official readiness test.
Keep a short list of unresolved booking details alongside your study notes. When your sitting approaches, use the final-week checklist to bring the learning and practical arrangements together. The aim is to arrive with confirmed instructions and a record of what you understand, rather than a set of assumptions borrowed from somebody else's exam.