1. Basics (2%-3%)
Key exam domainIdentify weak areas and improve with focused review.
Start PracticingPass your CP4 certification
Free CP4 Practice Test
Pass the Cathodic Protection Specialist (CP4) exam with confidence.
Start with a free CP4 practice test and build exam-ready confidence for the Cathodic Protection Specialist (CP4) exam.
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1000+CP4 Questions
13Exam Domains
10Free Questions
2026Updated
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Everything your CP4 certification prep needs
Practice expert-vetted questions, find your weak domains, and turn every mistake into a focused review plan.
Expert-vetted questions
Every question is reviewed by an experienced CP4 professional for clarity, accuracy and practical exam relevance.
See what to study next
Domain analytics show which parts of the exam blueprint are holding you back.
Turn mistakes into confidence
Missed questions become a review list, so nervous guessing turns into focused repetition.
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Study by domain
Practice the CP4 exam by domain
2. Insulators and Shorts (1%-3%)
Key exam domainIdentify weak areas and improve with focused review.
Start Practicing3. Periodic Surveys (1%-3%)
Key exam domainIdentify weak areas and improve with focused review.
Start Practicing4. Reference Cells (2%-5%)
Key exam domainIdentify weak areas and improve with focused review.
Start Practicing5. Field Tests (7%-16%)
Key exam domainIdentify weak areas and improve with focused review.
Start Practicing6. DC Stray Current Interference (6%-12%)
Key exam domainIdentify weak areas and improve with focused review.
Start Practicing7. AC Mitigation (2%-3%)
Key exam domainIdentify weak areas and improve with focused review.
Start Practicing8. Internal (1%-3%)
Key exam domainIdentify weak areas and improve with focused review.
Start Practicing9. Corrosion Theory (5%-10%)
Key exam domainIdentify weak areas and improve with focused review.
Start Practicing10. Polarization (3%-8%)
Key exam domainIdentify weak areas and improve with focused review.
Start Practicing11. Cathodic Protection (28%-35%)
Key exam domainIdentify weak areas and improve with focused review.
Start Practicing12. Codes and Compliance (1%-3%)
Key exam domainIdentify weak areas and improve with focused review.
Start Practicing13. Design (19%-23%)
Key exam domainIdentify weak areas and improve with focused review.
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Frequently asked questions
Straight answers about the CP4 exam, the questions, pricing, the free trial, and how this fits your prep.
The CP4 exam spans 13 domains - 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%), and Design (19%-23%). Every practice question maps to one of them, so you train on exactly what's tested.
The Cathodic Protection Specialist (CP4) exam has 75 questions and is completed in 6 hours. Our timed practice tests mirror that length and pacing, so exam day feels familiar.
No - and that matters. These are original practice questions written to mirror the style, difficulty, and domain coverage of the CP4 exam blueprint. We never distribute actual exam content, so practicing here keeps you fully compliant with official exam policies.
No. CP4 Exam Prep is an independent study resource for Cathodic Protection Specialist (CP4). It is not affiliated with, sponsored by, or endorsed by the official certifying body or exam administrator.
Every paid plan unlocks the full bank of 1,000+ practice questions covering all 13 CP4 domains - 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%), and Design (19%-23%). You can practice the whole bank, filter by domain, or run a timed, domain-balanced exam simulation.
Yes - the bank is maintained against the current exam outline, and questions are revised when the exam changes.
No honest practice platform can guarantee a pass. What realistic practice does is show you - before exam day - exactly which domains are weak, and give you the repetitions to fix them. That's the difference between hoping you're ready and knowing where you stand.
Yes. You get 10 free sample questions with instant feedback - no credit card and no account required.
The free sample shows you the question quality. Paid plans unlock the full 1,000+ question bank, exam-style practice modes, mistake review, and - on Fast Track and Pass Confidence - progress analytics that show your readiness by domain.
No. Every plan is a single one-time payment for a fixed access window - 48 hours, 7 days, or 6 weeks. There is no auto-renewal and no recurring billing.
Match it to your exam date: Final Review (2 days) for an exam in the next day or two, Fast Track (7 days) for an exam this week, Pass Confidence (6 weeks) for a structured run-up.
For most countries, the price you see is exactly what you pay - tax is already included. Where local law requires it to be added separately, it's shown clearly at checkout before you pay, so there are never any surprise fees.
Access is instant after payment and runs for your plan's full window from that moment. When the window ends, your local progress stays on your device - you can buy another window any time and pick up where you left off.
Yes - the whole platform is mobile-first: practice, mistake review, and analytics all work on any phone, tablet, or laptop with a browser. Nothing to install.
Every answer feeds your per-domain accuracy, readiness score, and weak-area list. Instead of re-reading everything, you drill the domains that are actually costing you points - that's what moves a score in days, not months.
Chat with us any time - the 24/7 support chat in the corner of every page gives instant answers about plans, access, and billing. Prefer email? The contact link is in the footer. Payments are processed securely by Stripe, and active customers can download an invoice from their profile page.
Make sure you're signed in with the same email you used at checkout - access activates within a minute of payment. If it still doesn't appear, email us from the contact link in the footer and it'll be sorted out.
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Flip, grade yourself, and repeat the tough ones until they stick.
Train with flashcards →Review Mistakes
Re-drill the questions you got wrong.
Review now →Review Weak Domains
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Trusted by CP4 candidates
Real feedback from CP4 candidates on Reddit.
"6 hours and 75 questions is brutal. almost didnt make it thru the design section since i never do that stuff day to day. field tests questions on this site got me comfortable enough to not panic on exam day. passed, barely studied the last week tho."
"put off studying for weeks then panicked about a month out. the mistake review feature on cp4exam.com actually showed me i kept messing up reference cell placement questions, which i wouldnt have caught otherwise. fixed that gap and it made the difference on test day."
"wasnt sure a website could actually prep you for something this niche but the polarization questions were basically dead on to what showed up. no calculator drama either since i knew what to expect going in. glad i didnt just wing it."