Trade certification · Arboriculture
ISA Certified Tree Climber (formerly Tree Worker Climber Specialist) — Practice Exam
The written part of the ISA Certified Tree Climber exam (the credential that replaced the Certified Tree Worker Climber Specialist): safety, climbing and rigging, tree removal, pruning, and tree identification and health, weighted like the official outline.
Questions last checked against the official sources on October 11, 2026.
The real exam at a glance
- Written exam
- 65 multiple choice (50 scored), 90 minutes
- Pass mark
- 80% written, 70% skills
- Skills exam
- 45-minute outdoor climb
- Eligibility
- 18 months' climbing experience, plus CPR, first aid and aerial rescue training
What you'll practise
Try a question
Why should limbs and trunk sections be sized to the work plan when removing a tree?
- Size and weight must suit extraction, site, weather and the crew's abilities
- Bigger is always faster
- Pieces should all be one length
- Size does not matter
Show the answer
A. Size and weight must suit extraction, site, weather and the crew's abilities — The outline lists removing parts to a size and weight appropriate to the plan.
Sample questions by topic (in English)
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Questions about the ISA Certified Tree Climber
Is this the official ISA Certified Tree Climber?
No. Semplr is independent and not affiliated with the exam body. We write every question ourselves, in the official format and at the official level.
What is the real ISA Certified Tree Climber like?
Written exam: 65 multiple choice (50 scored), 90 minutes. Pass mark: 80% written, 70% skills. Skills exam: 45-minute outdoor climb. Eligibility: 18 months' climbing experience, plus CPR, first aid and aerial rescue training.
How is my practice marked?
Instantly. You see your score against the pass mark, and an explanation for every question — including the ones you got right.
Can I take it on my phone?
Yes. The whole mock exam works on a phone, and your progress is saved in your browser.
Ready for a full run?
One sitting, real timing, then your score against the pass mark.
Start the free mock exam