About OH-PLB Exam Prep
An independent practice platform for the Ohio Plumbing Contractor License Exam (OH-PLB) exam - real questions across every exam domain, each with a plain-language explanation.
What's on the OH-PLB exam
The Ohio Plumbing Contractor License Exam (OH-PLB) exam is organized into 9 knowledge domains. It has 101 questions and is completed in 4 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:
- General Knowledge8% of the exam
- General Regulations20% of the exam
- Plumbing Fixtures6% of the exam
- Water Supply Systems10% of the exam
- Drainage, Waste, and Sanitary Vents24% of the exam
- Indirect Wastes3% of the exam
- Roof Drain Piping4% of the exam
- Specialty Plumbing5% of the exam
- Isometric Analysis20% of the exam
Every practice question on this site is organized across these 9 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.