Operating Systems Certification Test

The Operating Systems Certification Test is a free intermediate-level, 20-minute skill test from Science of Apps. It tests operating systems knowledge — processes, threads and scheduling, memory management and virtual memory, concurrency and synchronisation, and file systems, storage and I/O — at the level of university OS courses and systems engineering interviews in 2026 and 2027. Score 70% or more on its 20 questions to earn a verifiable Operating Systems certificate (SOA-OS). Every question is based on published standards and research — including Operating Systems: Three Easy Pieces (Remzi and Andrea Arpaci-Dusseau (University of Wisconsin–Madison)), Linux man-pages (kernel.org) — and each answer is explained with its source.

Take the free Operating Systems Certification Test on Science of Apps. It tests processes and threads, scheduling, and memory and virtual memory against a 2026–2027 syllabus, and passing earns a verifiable certificate you can add to LinkedIn.

Read the four skill areas on this page, then take the 20-minute test online — no fee, course or sign-up. You see every answer explained when you finish. Score 70% or more and you get a Operating Systems certificate straight away, on screen, as a PDF and by email, with a credential ID anyone can verify.

Yes. The questions are original scenarios written by Science of Apps, and each one is based on a public source you can read: Operating Systems: Three Easy Pieces (Remzi and Andrea Arpaci-Dusseau (University of Wisconsin–Madison)); Linux man-pages (kernel.org). The source is shown under each question and linked in the answer review. Science of Apps doesn't copy questions from other tests.

Four skill areas with five questions each, drawn from a bank of 10 per area so a retake brings new questions: Processes, Threads and Scheduling (Processes and threads, CPU scheduling and System calls); Memory Management (Paging and virtual memory, Page replacement and Allocation); Concurrency and Synchronisation (Locks and race conditions, Deadlock and Semaphores and condition variables); File Systems, Storage and I/O (File system structure, Journaling and reliability and I/O and devices). Every question is an original scenario written to the 2026–2027 standard, with the published source named under it.

Systems software engineer, Computer science student, Site reliability engineer, Embedded developer and Linux administrator. It suits anyone who wants a quick, verifiable way to show Operating Systems knowledge in 2026 and 2027, from students and career switchers to experienced professionals.

The core concepts every OS course and systems interview tests: processes and threads, CPU scheduling, virtual memory and paging, locks and deadlock, and file systems and I/O — the topics of OSTEP and similar textbooks.

It's vendor-neutral. Examples use Linux and POSIX terms where helpful, but the concepts apply to every modern OS.

Yes. The test is online, in English and free everywhere — people take it from India, the US, the UK, Europe, Africa, Latin America and Asia-Pacific. Your certificate is dated with your own local date and can be verified from anywhere at scienceofapps.com/certification/verify/.

20 questions — 5 from each of 4 skill areas — with a 20-minute limit. You need 70% (14 of 20) to pass and 90% for distinction.

We rate it Intermediate: assumes hands-on experience in the role. It has 20 scenario questions — 5 from each of 4 skill areas — and a 20-minute limit. You need 70% (14 of 20) to pass and 90% for distinction.

Nothing. There is no fee to take a test, to receive the certificate, to have it emailed or to verify it, and no sign-up.

On our server, not in your browser. The answers never reach the page until you submit, so a certificate can only be earned by passing. Each certificate gets a unique credential ID stored by Science of Apps.

You see your score for each area and every question with the correct answer and why, with the published source behind it. You can retake after 30 minutes, and the retake draws questions you haven't seen yet.

No. Every certificate is dated, so it always shows when you passed. Retake a test any time for a newer date or a higher score.

Yes. After you pass, Add to LinkedIn opens the Licenses & certifications form with the certificate name, Science of Apps as the issuer, the issue date, your credential ID and the verification link filled in. You can also download it as a PDF or PNG, and it's emailed to you as a PDF.

Every certificate has a credential ID and a QR code. Scanning it, or entering the ID at scienceofapps.com/certification/verify/, shows the holder's name, the certification, the score and the issue date from our records.

No. They are Science of Apps' own assessments of applied skill. They aren't issued by a university or standards body, and they work best alongside a portfolio that shows the skills in real work.