About CARO Exam Prep
An independent practice platform for the Certified Assistant Refrigeration Operator (CARO) exam - real questions across every exam domain, each with a plain-language explanation.
What's on the CARO exam
The Certified Assistant Refrigeration Operator (CARO) exam is organized into 10 knowledge domains. It has 110 questions and is completed in 3 hours. Each domain makes up a different share of the exam, so the most efficient way to prepare is to know where the weight sits and practice accordingly:
- Refrigeration fundamentals9% of the exam
- Refrigeration cycle8% of the exam
- Properties of refrigerants and refrigerant tables7% of the exam
- Types of refrigerant compressors6% of the exam
- Operation and maintenance of compressors14% of the exam
- Lubrication10% of the exam
- Evaporators and cooling units9% of the exam
- Condensers and high-pressure receivers12% of the exam
- Purging5% of the exam
- Safety, hazards, and prevention20% of the exam
Every practice question on this site is organized across these 10 domains, so your study tracks the real exam structure instead of guesswork. As you answer, the per-domain analytics surface the areas still costing you points, so your review goes where it moves your score.
What we believe good exam prep looks like
Realistic practice beats passive reading. Every question is written to mirror the style and difficulty of the real exam, with a clear explanation of why the right answer is right and the others aren't.
Your weak spots should find you. Domain analytics, mistake review, and re-drilling are built in, so study time goes where it moves your score.
Pricing should be simple. One payment for a fixed access window matched to your exam date. No subscription, no auto-renewal, and 10 free questions to try before you spend anything.
Get in touch
Questions, feedback, or something not working? Email support@boardmentor.study - candidate messages are read and answered.