Make the mistakes here,
not in the exam room.
Timed mock exams that match the real format. Every question verified before it ships, with explanations on every option. Free — practice without an account, sign in for timed mocks and saved progress.
- mocks
- questions
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- answered since launch
No mystery — answer
an actual question.
Pick an option. You'll see whether it's right and the worked explanation — the same review screen you get after a mock. No account.
Every cert worth chasing,
in one place.
Browse by vendor, drill into a track, pick the exam you're studying for. Certifications and entrance exams live side by side — more tracks light up as they clear verification.
Every question is verified
before it ships.
How depends on what can be proved: each question is routed to the strongest check its subject allows, and the check that ran is recorded.
Compiled and run on a real JDK.
Every code question is compiled and executed. The answer keyed as correct is the output the JVM actually produced — compile-error questions have to fail to compile, and exception questions have to actually throw.
Run against a real Oracle database.
Every query question executes for real. For “which query returns X?” questions, every option runs: the key has to produce X and each wrong option has to fail to — so the distractors are proved wrong, not assumed wrong.
Adversarially reviewed, checked against the docs.
Cloud, AI, and concept questions can't be settled by a program. Each one faces a second, different AI model hunting for a wrong key, two defensible answers, or an ambiguous stem — and anything it flags is checked against the vendor's own documentation.
Roughly 48% of the catalog is verified by execution; the other 52% is judged, not executed. I'd rather publish that split than imply the whole thing is machine-proved. If a question still looks wrong, there's a report button on every one — every report gets reviewed.
Things people ask before
their first mock.
No. Practice any pack without an account. Sign in when you want timed mocks, saved history, custom tests and the review queue — the questions you miss come back on a spaced schedule until they stick.
Ready to jump
through some hoops?
Free — no credit card. Every pack, mock and explanation. Practice any pack without an account — sign in when you want timed mocks and progress tracking.