How to choose a certification practice test

Start with the official free material

Before comparing third-party providers, use what the exam owner gives away. Official sample questions are written by the people who write the exam, so they are the best calibration you will get for wording and difficulty. They are also too few to prepare with on their own, which is why third-party banks exist.

• Microsoft: a free Practice Assessment on Microsoft Learn for most fundamentals and role-based exams, plus the exam sandbox, a demo of the exam interface. New exams usually get their Practice Assessment some weeks after launch.
• AWS: a free official practice question set for each exam on AWS Skill Builder, and sample questions in each exam guide.
• Google Cloud: sample questions linked from each certification page.
• ISC2: the free CC exam outline. ISC2’s One Million Certified in Cybersecurity programme, which gave away the CC course and exam, closed to new enrolments on 20 May 2026; codes already issued can be used until 31 December 2026.
• PMI: the PMP Examination Content Outline is free. PMI’s own practice product is paid.

Check coverage against the current exam outline

Open the official exam outline next to the provider’s topic list. Every domain should be there, with roughly as many questions per domain as the domain’s weight suggests. A bank that is heavy on the easy domain and thin on the hard one will flatter your score.

Then check the version. Exams are revised on a schedule: PMI replaced the PMP outline in July 2026, Microsoft retired AZ-500 for SC-500 the same year, and AWS moves its exams to new codes. A provider that names the current exam code and outline date on its pages has at least noticed the change. One that still describes an older version is selling you the wrong syllabus.

Judge the explanations, not the questions

Questions tell you what you got wrong. Explanations are what fix it. The useful standard is an explanation for every option: why the correct answer fits the constraint in the question, and why each wrong option fails. An explanation that only restates the right answer leaves you guessing next time the same idea is asked in different words.

Answer ten free questions and read every explanation, including the ones you got right. If they are circular (“C is correct because it is the best option”), the same length on every question, or contradicted by the vendor’s documentation, the rest of the bank will be no better.

Look for realistic timed simulations

Untimed practice builds knowledge. Timed, full-length mocks build pacing and stamina, and they are the only practice result that says much about readiness. A realistic simulation matches the real exam’s question count and time limit, draws questions across domains in the outline’s proportions, does not let you pause, and reports a score on the same scale as the real exam with a per-domain breakdown.

Check whether the timer is enforced. If a mock lets you pause, keep answering after time runs out or look things up mid-paper, its score measures something easier than the exam.

Ask how and when the bank is updated

A reliable provider can tell you when a question was last reviewed and what changes when the exam outline changes. Good signs are a visible “updated” date, a public record of which exam version the bank targets, and retired questions taken out of rotation when a service or rule changes. A single “updated for 2026” badge with nothing behind it tells you nothing.

Ask support directly if the site does not say. A provider that reviews its bank can usually answer in a sentence.

Red flags that rule a provider out

Walk away from any of these, whatever the price:

• It promises “real exam questions” or “actual questions from the test”. That is a brain dump. Using one breaks the candidate agreement every vendor makes you sign and can cost you the certification.
• It guarantees a pass. Nobody can, and a guarantee usually means the refund terms are where the real product is.
• It quotes pass rates or salary figures with no method behind them.
• The correct answer is usually the longest option, or usually in the same position. Test-wise guessing then beats studying, and your score stops meaning anything.
• You cannot see a single explanation before paying.

Use the free tier to make the decision

Most providers let you try some questions free. Use that trial to run the checks above on one domain you know well and one you do not. Thirty minutes spent this way tells you more than any review site.

SaveMyCert is built to pass this test, so you can check it the same way. Every published question explains each option, worked sample questions with answers sit openly on each certification’s practice page, mocks are timed by the server and scored on the exam’s own scale, and every study page names its official exam-guide source. You can answer questions without an account, within a daily allowance that a free account lifts.