Adaptive certification prep
Study less.
Get exam-ready.
ZeroRetake's Gap Engine finds what you haven't mastered yet and drills only that — so you stop re-studying what you already know and get exam-ready in a fraction of the time.
Buy the book → scan the printed code → unlock the full online practice bank free.
The agent's final answer looks correct, but you must verify it actually wrote to the system of record. Which check belongs in the release gate?
The shelfStudy guide + practice tests
Every book unlocks its own free online bank.
Know before you go
Walk in when the number says go.
As you practice, ZeroRetake gives you a readiness score that tracks how ready you are across the exam's objectives — built from real practice, not a random pile of questions.
Above your readiness target, you're ready — book it. Still short, keep drilling. No more walking in unsure.
Switch the card between Day one and Exam ready. Most people start below their readiness target and drill up from there. You leave only when you're safely above it.
Example — readiness across the exam objectives, above your target
Example: your readiness builds domain by domain as you practice, so you can see where to focus next. It is a study guide, not a pass prediction.
Most prep teaches the subject. We rehearse the exam.
Four steps from the book to exam-ready.
Read it once
A dense, no-filler study guide plus full-length practice tests — the Kindle edition that gets you in the door.
Open the Gap Engine
The code inside the book unlocks the Gap Engine for your exam free — yours through every attempt.
Drill the gaps
The Gap Engine keeps serving the domains you miss and tracks mastery per objective until the weak ones aren’t.
Sit it once
Go when your readiness clears the target. One seat, one attempt — that’s the whole point.
Not ready to buy? Get 10 free questions.
Tell us your email and we'll send 10 real practice questions — with worked explanations — straight to your inbox.
Rather test yourself first? Take the free 10-question readiness check →
Buy the book. The practice comes free.
Scan the printed code in your book to unlock the full online practice bank free — every question, the timed mock, and your readiness score.
Before you ask
Is the content current?
Every exam tracks the vendor’s current exam guide — the official objectives — and new certs go up within days of launch. The agentic-AI wave is already live.
Is this official?
No — ZeroRetake is independent prep, not affiliated with the vendors. That’s why we can move faster and cost a fraction of official training.
How many questions do I get?
Full-length mock exams in the book, plus an adaptive bank that keeps serving more practice on your weak domains until you’ve cleared them.
What if I don’t pass?
Your book code keeps the online practice bank unlocked through every attempt, so you can keep drilling your weak domains until your readiness clears the target.
Is it a subscription?
Not if you buy the book. The book is a one-time purchase on Amazon, and its printed code unlocks that exam’s online practice bank free, with no recurring charge. If you want every certification exam, All-Access is an optional subscription or 3-month pass sold in the ZeroRetake app for iPhone and iPad.
Which exams do you cover?
210 exam banks across AWS, Microsoft Azure, Google Cloud, Kubernetes, NVIDIA, GitHub, HashiCorp, CompTIA, MongoDB and Anthropic. Searching yours above is the fastest check.
0 retakes.
Walk in exam-ready. That's the idea behind the name.
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