About CP4 Exam Prep
An independent practice platform for the Cathodic Protection Specialist (CP4) exam - real questions across every exam domain, each with a plain-language explanation.
What's on the CP4 exam
The Cathodic Protection Specialist (CP4) exam is organized into 13 knowledge domains. It has 75 questions and is completed in 6 hours. Here is what it covers:
- Basics (2%-3%)
- Insulators and Shorts (1%-3%)
- Periodic Surveys (1%-3%)
- Reference Cells (2%-5%)
- Field Tests (7%-16%)
- DC Stray Current Interference (6%-12%)
- AC Mitigation (2%-3%)
- Internal (1%-3%)
- Corrosion Theory (5%-10%)
- Polarization (3%-8%)
- Cathodic Protection (28%-35%)
- Codes and Compliance (1%-3%)
- Design (19%-23%)
Every practice question on this site is organized across these 13 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.