What Is CST?

What CST Means Here

The acronym CST is crowded. Several unrelated professions and credentials use the same three letters, and a quick search will mix them together. On this site, CST means Computer Service Technician, a computer-hardware and support credential. It is not a surgical-technologist credential, not a civil-service examination, and not tied to any other field that borrows the abbreviation.

If you landed here looking for a different CST, the short version is that nothing in this article applies to it. If you want the broader vocabulary behind the abbreviation, our explainers on what CST stands for and the meaning of CST cover the naming question, while this article focuses on what the Computer Service Technician credential actually tests and requires.

In practical terms, a Computer Service Technician is the person who opens the case, swaps the failed part, configures the operating system, and gets the machine back to a working state. The credential exists to show that a technician can do that work competently and safely. For a deeper definition, see what a CST is as a job role.

Who Issues the Credential

The Computer Service Technician certification is administered by ETA International, an organization known for certifying technicians in electronics and information technology. The content of the exam is defined by a published document, 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 for each area, so you cannot assume that one domain carries more questions than another. Prepare broadly.
• The document retains named legacy and current technologies. It does not simply mirror a marketing-page topic list or another vendor's blueprint, so your study should follow the ETA competency headings rather than a different certification's outline.

For a general orientation to the credential itself, you can also read what CST certification is and the overview at CST certification.

Exam Format and Test-Day Rules

The CST is a proctored theory examination. There is no hands-on assessment, so nobody asks you to build a PC or crimp a cable on camera. Your knowledge is tested entirely through questions.

Two small rules deserve attention. First, the calculator must be non-programmable; bring a plain scientific model, not a graphing or programmable one. Second, used scratch paper must be surrendered at the end, so do not plan on keeping your notes.

At a 75% threshold across 80 questions, you need roughly 60 correct answers. For the arithmetic and what it means for your margin of error, see the CST passing score breakdown.

Fees, Proctoring, and the Free Retake

The cost structure is simple, but the remote-proctoring fee catches people off guard.

• Exam fee: USD 80.
• Remote proctoring (ExamRoom.AI): an additional USD 16 for the two-hour proctoring session, arranged through ETA.
• Free retake: one free examination retake is available within one year of the initial session.
• Retake proctoring caveat: if you take the free retake remotely, the USD 16 proctoring fee still applies.

That last point is the one most candidates miss. "Free" covers the exam fee, not the proctoring charge. If you choose an onsite session administered by an ETA Certification Administrator, you avoid the remote proctoring fee, although the test site may have its own arrangements to confirm directly. For the full picture of fees across the certification lifecycle, including maintenance, read the CST certification cost breakdown.

The one-year window on the retake is also a planning tool. If you fail, you have time to rebuild weak areas rather than rushing back in. Use the first attempt's experience to identify which competency areas surprised you, then target those.

The 14 Competency Areas

The exam draws from 14 headings in ETA's competency document. Because they are unweighted, treat each as fair game. Below are the areas grouped by theme, with the kind of knowledge each demands. A fuller walkthrough lives in the complete guide to all 14 CST content areas.

Legacy and Current Technology

One distinctive feature of the CST is that the competency document keeps named legacy technologies alongside current ones. The operating-systems heading is the clearest example: it explicitly lists Windows™ 7, 8, 10, and 11 together with Linux and Apple mac™. A candidate who studies only the newest Windows release is underprepared for this exam.

This is a real strategic difference from credentials that rapidly retire old material. For the CST, older technologies stay in scope because technicians in the field still encounter them. When you study, do not skip a topic because it feels outdated. If a competency heading names it, it can appear.

Eligibility, CETa, and the A+ Rollover

The standalone CST does not require the CETa (Certified Electronics Technician associate) credential. ETA's competency document does suggest CETa or equivalent basic electronics preparation, which makes sense given the electrical content in the power and safety areas. Think of it as a recommendation for readiness rather than a gate.

Two related routes are worth knowing:

• Journeyman path: requires CETa and at least two years of combined training and experience.
• CompTIA A+ rollover: a valid CompTIA A+ (ce), but not a lifetime A+, qualifies for a separate USD 80 CST rollover route.

The distinction between "ce" and lifetime A+ is easy to overlook, so check the status of your existing credential before planning around the rollover. For the full eligibility picture, see CST requirements and how to qualify.

Keeping the Certification Active

A CST certification is valid for four years. Standard maintenance involves three pieces:

1. The maintenance form.
2. Either 10 continuing-education contact hours per year (40 over the four-year cycle) or supervisor-completed employer verification.
3. A fee of USD 25 per year, or USD 100 per four-year cycle.

The employer-verification option is useful for technicians whose day job already demonstrates ongoing competence, since it can substitute for logged continuing-education hours. If you prefer to document learning yourself, the 10-hours-per-year route gives you a clear annual target. Plan for it early rather than scrambling in year four.

Where the Credential Gets Used

Computer Service Technicians work wherever computers need to be built, repaired, configured, and kept running. Typical settings include internal IT support desks, repair shops, managed-service providers, schools, and organizations that maintain fleets of desktops and portables. The competency areas reflect that breadth: a technician may open a laptop in the morning, troubleshoot a network connection at noon, and reinstall an operating system in the afternoon.

The credential is most valuable as proof of broad, vendor-neutral hardware and service knowledge, which is attractive to employers who want a technician who can handle mixed environments. To explore the role in practice, browse CST jobs, and for the earnings side see the CST salary guide. If you are weighing the investment, the ROI analysis walks through the trade-offs without overstating the payoff.

Sequencing Your Preparation

Since the 14 areas are unweighted, a sensible plan covers all of them, ordering topics by dependency. Hardware fundamentals feed troubleshooting, so learn the parts before the diagnosis. A broader plan is laid out in the CST study guide, but here is a CST-specific sequence you can adapt.

Troubleshooting sits late on purpose: it draws on everything before it, so it is the best place to find gaps. Use timed practice to test pacing, since two hours for 80 questions leaves roughly 90 seconds per question. You can drill on our CST practice tests, and the CST cheat sheet works well as a final-week review. To calibrate expectations, see how hard the CST exam is and what the pass-rate data shows.

Frequently Asked Questions