What Is A CST?

What "CST" Means Here

The acronym CST is shared by several unrelated credentials. In the surgical field it refers to a surgical technologist; in some public-sector contexts it refers to a civil-service examination. This article is about neither. On this site, CST means Computer Service Technician: a vendor-neutral certification for people who install, upgrade, maintain, and repair personal computer systems.

If you landed here searching for a quick definition, the short version is this: a CST is a technician who has passed a proctored theory examination covering the hardware, software, and service practices involved in keeping computers running. If you want the same answer phrased in other ways, the site also covers what CST stands for, what CST means, and the broader meaning of CST. For the credential itself, see the overview at CST certification.

Who Issues the Credential

The Computer Service Technician certification is issued by ETA International, an organization that certifies technicians across electronics, information technology, and related disciplines. The exam content is defined in a published document titled Computer Service Technician - CST Competency Requirements (copyright 2025). That document lists the 14 competency headings the examination draws from.

Two details about that document matter for candidates:

• The 14 headings are unweighted. ETA does not publish a percentage breakdown per area, so any study plan that claims "Domain X is exactly Y% of the test" is inventing a number.
• The document intentionally retains both legacy and current technologies. It is not a rewrite of another vendor's blueprint, and it should not be studied as if it were one.

What the Exam Looks Like

The CST is a proctored theory examination. There is no hands-on assessment: you will not be asked to seat a processor or crimp a cable in front of an examiner. Instead, you demonstrate that you understand how those tasks are done, why they are done that way, and what goes wrong when they are done badly.

At 80 questions in 120 minutes, you have an average of roughly a minute and a half per question. That is generous for recall items but tighter for scenario questions that require you to reason through a symptom. For the exact scoring threshold, see CST passing score; for a candid look at difficulty, see how hard the CST exam is. Published pass-rate figures are limited, and the discussion in CST pass rate explains what can and cannot be said about them.

The 14 Competency Areas

The official competencies fall into 14 headings. Each is described below with the kind of understanding a candidate should be building. For a deeper walkthrough of each, see the complete guide to all 14 CST content areas.

Legacy and Current Technologies

One of the quirks that distinguishes this credential from marketing-driven topic lists is that the competency document keeps older technologies in scope alongside current ones. The operating-systems heading is a visible example: it names Windows 7, 8, 10, and 11, plus Linux and Apple macOS. A candidate who studied only the newest releases could be caught off guard by a question about an older platform or an older interface.

Registration, Fees, and Test Day

The mechanics are straightforward, but the details differ depending on where you test.

Fees

• Exam fee: USD 80.
• Remote proctoring: If you test remotely through ExamRoom.AI, arranged through ETA, there is an additional USD 16 two-hour proctoring fee. That fee applies even to a free retake.
• Retake: One free examination retake is available within one year of your initial session.

For the complete picture, including maintenance costs over the life of the credential, see CST certification cost.

Onsite versus remote

Onsite testing is administered by an ETA Certification Administrator using either Trapeza online testing or paper and pencil. Remote testing runs through ExamRoom.AI. Scheduling windows and deadlines are covered in CST exam dates.

Test-day rules

• A photo ID is required.
• Scratch paper and a non-programmable scientific calculator are permitted.
• Used scratch paper must be surrendered at the end.

The calculator allowance is a useful hint about content: the power and electrical concepts in Domain 9 may involve simple calculations, so practice with a non-programmable scientific calculator before test day rather than discovering its quirks during the exam.

Prerequisites, Journeyman Path, and A+ Rollover

A common question is whether you need another certification first. For the standalone CST, the answer is no: it does not require the CETa (Certified Electronics Technician associate). However, the competency document suggests CETa or equivalent basic electronics preparation, which makes sense given the power-supply and electrical material in the exam.

Note the specific wording on the rollover: it applies to a valid A+ (ce) credential and explicitly not to lifetime A+. If you hold an A+, check which version you have before assuming you can use this route. A fuller treatment of eligibility is in CST requirements.

The Four-Year Certification Cycle

Passing the exam is not the end of your obligations. The CST credential lasts four years. To maintain it, you complete the maintenance form and satisfy one of two pathways:

• Continuing education: 10 contact hours per year (40 over the four-year cycle), or
• Employer verification: a supervisor-completed verification of your work.

In addition, there is a maintenance fee of USD 25 per year, or USD 100 per four-year cycle. This structure is friendly to working technicians: if your job already keeps you current, supervisor verification may spare you from accumulating separate training hours.

Who Holds a CST and Where They Work

The Computer Service Technician credential is aimed at people whose daily work involves personal computers: building them, repairing them, upgrading them, and keeping them secure and running for other people. That describes a wide range of employers: independent repair shops, managed-service and IT support firms, in-house help desks and desktop-support teams, and organizations that maintain fleets of workstations and portables.

Because the exam is vendor-neutral and theory-based, it works as a credible baseline signal: it tells an employer you understand the fundamentals across hardware, operating systems, networking, and troubleshooting, regardless of which brands you happen to have worked with. Whether that signal translates into better pay or faster hiring depends on your market and experience; the discussion in CST salary guide and is the CST certification worth it weighs that honestly, and role types are surveyed in CST jobs.

If you are new to the term and want the general framing before going deeper, the companion explainers what is CST and what is CST certification cover the same ground from slightly different angles.

Sequencing Your Prep Around the Domains

Since the 14 headings are unweighted, there is no mathematically "most important" area to prioritize. A sensible approach is to sequence by dependency: later topics assume earlier ones. Here is one way to order a six-week effort, tied directly to the competencies.

Domain 12 is placed last on purpose: troubleshooting questions draw on everything before it, so it pays to learn the components before learning how they fail. For a fuller plan, see the CST study guide, the structured options in CST training, and the condensed reference in the CST cheat sheet. When you are ready to test yourself under realistic conditions, the CST practice tests let you rehearse the 80-question, two-hour format, and the main practice site is the place to track which domains still need work.

Frequently Asked Questions