CST Passing Score 2026: Exactly What You Need to Pass

The Number: 75% of 80 Questions

If you are searching for the Computer Service Technician (CST) passing score, the answer is short: you need 75%. The exam, administered through ETA International, contains 80 questions and gives you two hours to complete them. There is no scaled-score mystery to decode and no separate hands-on component that can rescue or sink you. It is a proctored theory examination, and your result depends entirely on how many written questions you answer correctly.

That simplicity is useful, but it also means the details around the number matter. This guide walks through what 75% looks like in practice, how the exam is delivered, how the 14 official competency areas affect your preparation, and what happens if your first attempt falls short. If you want the broader picture of difficulty first, see How Hard Is the CST Exam? Complete Difficulty Guide 2026.

What 75% Actually Means in Questions

With 80 questions on the exam and a 75% passing score, the arithmetic is straightforward: you need 60 correct answers to reach the cut score, which means you can miss up to 20 questions and still pass. Two hours for 80 questions works out to roughly a minute and a half per question, which is generous for a theory exam made up of recall and applied-knowledge items on hardware, operating systems, and troubleshooting.

The practical takeaway is that the margin for error is real but not enormous. Twenty misses sounds comfortable until you realize the exam spans fourteen distinct areas, from safety and assembly to file management and operating systems. A few unfamiliar topics in several domains can add up quickly.

How the Exam Is Delivered and Scored

Onsite testing

Onsite testing is administered by an ETA Certification Administrator. Depending on the test site, you will take the exam either on the Trapeza online testing platform or on paper and pencil. Either way, the content and the 75% standard are the same. Check the test site details before booking so you know which format to expect.

Remote proctoring

If you cannot test onsite, remote proctoring through ExamRoom.AI is arranged through ETA. It adds a USD 16 two-hour proctoring fee, and that fee applies even to a free exam retake. Budget for it up front if you plan to test from home, because it is separate from the USD 80 exam fee. For a full cost walk-through, see CST Certification Cost 2026: Complete Pricing Breakdown.

Test-day rules that affect your performance

• Photo ID is required. Bring valid identification or you may not be allowed to test.
• Scratch paper is permitted. Used scratch paper must be surrendered at the end.
• A non-programmable scientific calculator is permitted. This matters for electrical questions on power supplies, voltage, current, and resistance, so practice with a simple scientific calculator before test day.

Where Your Points Come From: The 14 Competency Areas

ETA publishes the 14 headings as official examination competencies in its Computer Service Technician competency requirements document. Importantly, these headings are unweighted. The published material does not tell you that one area counts for a fixed percentage of the exam, so you should not build a plan around guessing which domains are "bigger." The safer approach is to be competent across all fourteen. For a detailed breakdown of each area, read CST Exam Domains 2026: Complete Guide to All 14 Content Areas.

Notice that ETA names both legacy and current technologies, including Windows 7 and 8 alongside Windows 10 and 11. Do not assume older material is irrelevant just because it feels dated. The competency document is the authority on what can appear, so study to that list rather than to a generic modern-only topic outline.

Test-Day Strategy for a Fixed Cut Score

Because the target is fixed at 75%, you can plan around a concrete number rather than a vague goal of "doing well." Here is how to use that.

1. Aim for a buffer above 60 correct. If your practice results hover right at 75%, test-day nerves can push you under. Build in a cushion during preparation.
2. Secure the high-confidence domains first. Safety, I/O ports, and assembly questions tend to reward clear factual recall. Banking those points early protects your margin.
3. Do not abandon weak domains. Since all 14 headings are unweighted and you cannot know exactly how items are distributed, a domain you skip can quietly cost you several questions.
4. Use the time. With about a minute and a half per question, you can afford to read carefully, flag uncertain items, and return to them rather than rushing.
5. Use scratch paper deliberately. Write out electrical relationships before calculating, and remember to surrender the paper when you finish.

If You Miss the Cut: Retake and Cost Mechanics

Falling short of 75% is not the end of the road. ETA provides one free examination retake within one year of your initial session. That gives you a real second chance without paying the USD 80 exam fee again.

There is one cost catch: if you choose remote proctoring through ExamRoom.AI, the USD 16 two-hour proctoring fee still applies to the free retake. Testing onsite avoids that particular fee, though you should confirm availability at a test site near you.

Use the gap between attempts wisely. Review which areas felt shakiest, then rebuild those domains before you return. If you want a structured approach, CST Study Guide 2026: How to Pass on Your First Attempt lays out a method that works equally well for a second attempt. You can also gauge your readiness with timed practice questions on the main CST practice test site.

Rollover and Other Routes to the Credential

Standalone CST

The standalone Computer Service Technician credential does not require the Certified Electronics Technician associate (CETa) certification. However, the ETA competency document suggests CETa or equivalent basic electronics preparation, which is especially helpful for the power supply and electrical concepts domain. For a full eligibility rundown, see CST Requirements 2026: Eligibility, Prerequisites & How to Qualify.

Journeyman path

The Journeyman path is a separate track. It requires CETa plus at least two years of combined training and experience. It is not a shortcut around the exam standard; it is an additional level for candidates who meet those conditions.

CompTIA A+ rollover

A valid CompTIA A+ (ce) certification, but not a lifetime A+, qualifies you for a separate rollover route, which carries its own USD 80 fee. This is a distinct pathway from sitting the 80-question theory exam, so confirm the current rollover steps with ETA before relying on it. If you are weighing the credential against others you already hold, Is the CST Certification Worth It? Complete ROI Analysis 2026 can help you decide.

A Domain-Ordered Prep Plan

Since the goal is a comfortable margin above 60 correct answers, order your study so that foundational domains come first and integrative topics come last. This is the one place a schedule is worth sketching, and it is tied directly to how the CST domains build on each other.

Hardware first makes sense because troubleshooting questions in the last week assume you already understand the components involved. Finish with at least one full 80-question timed run so the two-hour pace feels natural. For a condensed refresher right before test day, the CST Cheat Sheet 2026: One-Page Review of Must-Know Facts is a good last pass.

After You Pass: Keeping the Credential Valid

Earning the credential is only the start. Certification lasts four years, and maintaining it has specific requirements:

• Submit the maintenance form.
• Complete 10 continuing-education contact hours per year (40 over the four-year cycle), or provide supervisor-completed employer verification.
• Pay USD 25 per year, which totals USD 100 over a four-year cycle.

Once certified, the credential supports roles in computer repair, help desk, and technical support settings. To see how it translates into earnings and openings, explore CST Salary Guide 2026: Complete Earnings Analysis and CST Jobs.

Frequently Asked Questions

Ready to measure where you stand against the 75% line? Take timed questions on the CST practice test site, and review CST Pass Rate 2026: What the Data Shows and CST Exam Dates 2026: Testing Windows, Deadlines & Scheduling to plan your attempt.