Failing a certification exam does not end your candidacy at any major vendor: it only starts a waiting-period clock. AWS makes you wait 14 calendar days after a failed attempt, with no limit on attempts but a full registration fee each time, while CompTIA lets you book a second attempt immediately and only imposes a 14-day wait from the third attempt onward. Microsoft keeps failing candidates on the same schedule as everyone else but renews passing candidates free of charge each year. This guide consolidates the exact rules, what a failed attempt costs you, and a recovery plan for the weeks between attempts.
What the rules say
Each vendor writes its retake policy separately, so the practical constraint differs by exam family. The table below is the short version of what you face after a failed attempt:
| Vendor | Wait after failing | Cost of a retake | Attempt limit | Cycle after passing |
|---|---|---|---|---|
| AWS | 14 calendar days | Full registration fee | No limit on attempts | Passed exams cannot be retaken for two years |
| CompTIA | None between first and second attempt; 14 calendar days before the third | Full exam price, no free re-tests | No fixed limit | Certification expires three years from the certification date |
| Microsoft | Normal scheduling rules apply | Full exam price | Normal scheduling rules apply | Free annual renewal via unproctored assessment |
Two details catch candidates off guard. First, the two-year AWS rule applies after you pass: retaking an exam you already passed is not allowed until two years have elapsed, so a passed exam cannot be refreshed on demand. Second, CompTIA states that a test found to be in violation of the retake policy will be invalidated, and repeat violators face a permanent ban from the program — scheduling within a prohibited window risks the score, not just a delay.
Turning the wait into a plan
The waiting period is not dead time if you treat it as a diagnostic window. Use this procedure, adapted to whether you face CompTIA’s zero-day second attempt or AWS’s two-week pause:
- Write down the domain breakdown the same day. Score reports list performance by domain; a failure driven by one weak domain needs a different plan than a uniform miss.
- Decide your reschedule window within 48 hours. A CompTIA candidate who failed by a narrow margin can book immediately while the exam experience is fresh; an AWS candidate should pick a date roughly 16–20 days out, leaving study days on both sides of the eligibility date.
- Rebuild the study plan around the two weakest domains. Allocate roughly half of remaining study time to them, and verify every topic against the current official exam objectives, because domain weights and versions change between exam series.
- Switch question sources. If you exhausted one bank before the failed attempt, drilling the same items measures memory, not skill. Fresh timed sets are the point of practice tests such as our Professional Scrum Master I (PSM I) Season 2 practice test and the original Professional Scrum Master (PSM I) practice test.
- Simulate the delivery mode once. A failed online-proctored session is sometimes a process failure, not a knowledge failure; one full rehearsal under the same rules removes that variable.
What failure costs you
The direct cost is the exam fee, paid again in full: CompTIA does not offer any free re-tests or discounts on retakes, and AWS likewise charges the full registration fee for each attempt. Beyond the fee, budget for the calendar. An AWS candidate who fails on day zero and needs three weeks of targeted study is realistically looking at a five-to-six week gap between attempts, which matters if a job posting or employer deadline sits in between. The indirect cost is confidence, and the cheapest mitigation is a written diagnosis: candidates who can name the two domains that failed them recover faster than those who only remember the score.
Retakes versus renewals
Do not confuse failing-and-retesting with keeping a passed credential alive; the rules and the money differ. Your Continuing Education renewal cycle is three years from the date you earned your CompTIA certification, and renewal happens through CE activity, not through re-sitting the exam — in fact, CompTIA candidates who passed an exam cannot take it again under the same exam code without prior consent. Microsoft goes further: renewals are free for associate, expert and specialty certifications, with a six-month eligibility window in which an unproctored, open-book assessment extends the credential one year past its expiration date, and Fundamentals certifications do not expire at all. AWS completes the picture with the two-year no-retake rule for passed exams and its three-year validity term, which is why planning the renewal path before it is urgent beats paying a fresh exam fee later.