Free ISA Certified Arborist Practice Exam
100 questions, 105 minutes, no sign-up. The questions cover all 10 domains of ISA's exam outline in the same proportions as the real exam, and the clock runs at the real exam's pace (200 questions in 210 minutes). When you submit, you see your overall score, your score in each domain and your two weakest domains, with free practice for each.
Your answers stay in this browser. The questions are our own, written from public sources and checked twice; this is not an ISA exam, and we are not affiliated with ISA.
Start the practice exam
- 100 multiple-choice questions, one at a time
- A 105-minute timer that keeps running if you leave the page
- Flag questions and come back to them; answers and explanations are shown at the end
What's in the exam
The questions per domain follow ISA's published exam weights, so the heaviest domains count most here too. About a quarter of the questions are easy, half are medium and a quarter are hard (26 / 51 / 23). None of them appear on our free practice pages, so they are new to you even if you have practiced here before.
| Domain | Share of the exam | Questions here |
|---|---|---|
| Tree Biology | 11% | 11 |
| Tree Identification and Selection | 9% | 9 |
| Soil Management | 7% | 7 |
| Installation and Establishment | 9% | 9 |
| Pruning | 14% | 14 |
| Diagnosis and Treatment | 9% | 9 |
| Trees and Construction | 9% | 9 |
| Tree Risk | 11% | 11 |
| Safe Work Practices | 15% | 15 |
| Urban Forestry | 6% | 6 |
How it compares with the real exam
The real ISA Certified Arborist exam has 200 questions in 210 minutes. 20 of them are unscored trial questions, and you need 76% of the scored ones to pass. This practice exam is half the length at the same pace, and every question counts. Our exam guide covers eligibility, fees and booking, and how hard the exam is explains the passing score in detail.
How to use your results
- Start with your two weakest domains. The results link to the free practice questions for each one.
- Weigh by exam share. A weak result in Safe Work Practices or Pruning costs more on the real exam than one in a small domain.
- Read the explanations. Every answer at the end comes with the reason and the public source it rests on.
- Retake later. The same 100 questions return in a new order, which shows what has stuck.
Where the questions come from
Every question is original and rests on public sources: university extension services, the USDA Forest Service, OSHA and similar. Each one was answered blind by a second reviewer and checked against its source before it went live. The 100 questions here come from our reviewed bank of 591. See sources and review process for how that works.
Questions about the practice exam
Is the practice exam really free? Do I need an account?
Yes, it is free, and there is no account, email or sign-up. Your answers and the timer are kept only in this browser, so you can close the tab and come back to finish.
Are these real ISA exam questions?
No. ISA does not publish its exam questions. These are our own questions, written from public sources such as university extension services, the USDA Forest Service and OSHA, and checked by a second reviewer. Arborist Practice Test is not affiliated with ISA.
What score should I aim for?
The real exam's passing standard is 76% of the scored questions, so aim for at least that here. Treat the result as a guide to where you stand and what to study, not as a prediction of your exam result.
Can I take it again?
Yes. A retake uses the same 100 questions in a new order, so it shows what you remember rather than how you would do on unseen questions. For new questions, use the free practice for each domain; full-length timed mock exams with fresh questions open soon.