Four steps, in order
Practise, then find out what it proved
The path runs from a certification you pick to a per-objective account of where your marks went. Nothing in it forecasts your exam result, and nothing in it costs money.
The path
Start anywhere; the record follows you
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Pick a certification
The home page lists what is available. Each certification has its own page carrying its exam guide version, its question bank and only the modes it genuinely offers.
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Practise, and see why
Answer one scenario at a time, untimed. The explanation lands immediately: why the right answer is right, why the option you picked is wrong, and a link to the documentation page that settles it.
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Sit the mock under the clock
A full-length timed paper, in the shape the vendor publishes for that exam. Flag a question, defer it, jump around the grid, the same moves you have in the real sitting. Nothing is revealed until you submit.
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Read what your answers showed
Every finished session freezes into a report card: your marks, the questions you missed, and the breakdown by objective. Revision then goes where you are actually losing marks.
Two habits the tool keeps
Both cost you something, and both are the point
Asking counts against you
Stuck on a question, you can ask for a hint or reveal the answer. Either one marks the item assisted, and an assisted item is never counted as correct: not in the session tally, not in the per-objective breakdown.
A tool that let you reveal your way to 95% would be pleasant and useless. The score you see is the score you earned unaided.
Why there is no readiness score
Your readiness page reports one of three states, insufficient evidence, building coverage, or consistent practice evidence, from how much you have actually answered and how much of the blueprint it touched.
None of them is a prediction. Vendors publish a certification result as pass or fail, with no mapping from any practice tool, so a probability here would be a number somebody made up.
What you need
A Google account. That is the whole sign-up: no card, no email confirmation, no trial that expires. Signing in is what gives your history somewhere to live, and it is what keeps the question bank away from scrapers.
Public information pages and certification overviews are open without signing in. Your report cards, readiness and account pages require sign-in. Public pages include this page, the background, the argument for building it this way, the prices and each certification's overview.