- What Is USPS 955 Certification, Exactly?
- Who Administers the Exam and What It Costs
- Exam Format: Multicraft and Spatial Relations
- The 9 Content Domains You'll Be Tested On
- Scoring, Passing, and Veterans' Preference
- Retest Rules and How Long Scores Last
- Jobs You Can Qualify For
- Who Can Take the Exam
- Common Myths, Including the 473 Mix-Up
- A Domain-Aware Way to Prepare
- Frequently Asked Questions
- USPS 955 is administered directly by USPS under Handbook EL-304 - no commercial testing vendor is involved.
- USPS never charges a fee for this exam; any payment request is a scam.
- The exam has exactly two parts: Multicraft (60 items, 60 minutes) and Spatial Relations (68 items, 40 minutes).
- You need a minimum score of 70 to be considered, with eligible ratings from 70 to 100.
What Is USPS 955 Certification, Exactly?
USPS 955, formally known as USPS Maintenance Exam 955, is the assessment the United States Postal Service uses to screen candidates for skilled maintenance craft positions. It is not a third-party professional certification you study for at your own pace and schedule through a testing company - it is a government-administered selection exam governed by Handbook EL-304, the Maintenance Selection System. If you're just getting oriented, our companion piece What Is USPS 955? covers the basics, and USPS 955 Meaning explains where the number and name come from.
Because the "USPS 955" label happens to overlap with names used by unrelated certifications in other industries, it's worth stating plainly: everything in this article refers only to the maintenance selection exam that USPS itself administers to fill mechanical and electrical craft jobs in its facilities.
Who Administers the Exam and What It Costs
USPS administers the exam itself - computer-delivered, proctored, and requiring valid photo identification at check-in. There is no fee to take it. USPS is explicit that it never charges for exams, job applications, or employment information of any kind. If you encounter a listing, email, or "prep service" demanding payment to register for the actual exam, that is a red flag: the Postal Inspection Service treats requests for exam payment as an employment scam.
This matters for anyone researching costs online, since many unrelated certifications do charge exam fees and some scam operations trade on that confusion. For a full breakdown of what you should and shouldn't expect to pay related to this process, see USPS 955 Certification Cost 2026: Complete Pricing Breakdown.
Exam Format: Multicraft and Spatial Relations
The official USPS Assessment Information Package for Exam 955 defines exactly two parts, and understanding their structure is more useful than any generic "test-taking tips" advice.
Part 1: Multicraft
60 items in 60 minutes. This section measures mechanical and electrical job skills that maintenance craft employees use on the job - reading circuits, understanding mechanical systems, and applying technical knowledge across multiple trade areas.
- One minute per item on average, so pacing matters
- Draws from technical content spanning electrical, mechanical, and shop-based knowledge
Part 2: Spatial Relations
68 items in 40 minutes, split into two distinct skills: Matching Parts and Figures, where you determine which figure shows how loose pieces fit together without gaps or overlap, and Spatial Visualization, where you decide which solid object would produce a given set of top, front, and right views.
- Faster pace than Multicraft - roughly 35 seconds per item
- Tests visual-spatial reasoning rather than memorized facts
Combined, the two parts run roughly two hours. Both are computer-delivered under proctored conditions. If you want a deeper walk-through of question styles and pacing strategy for each part, USPS 955 Study Guide 2026: How to Pass on Your First Attempt goes section by section.
The 9 Content Domains You'll Be Tested On
Content for Exam 955 is drawn from 21 technical fields covering roughly 131 topics, organized here into nine practical domains that mix hands-on craft knowledge with the underlying scientific theory behind it:
- Domain 1: AC/DC Theory, Power Distribution, and Electrical Maintenance
- Domain 2: Motors, Control Circuits, Schematics, and Print Reading
- Domain 3: Digital Electronics, Power Supplies, Computers, and Test Instruments
- Domain 4: Hydraulics and Pneumatics
- Domain 5: Pumps, Piping and Combustion
- Domain 6: Power Transmission, Lubrication, Mechanical Maintenance, and Shop Machines, Tools and Equipment
- Domain 7: Welding and Rigging
- Domain 8: Spatial Relations - Matching Parts and Figures
- Domain 9: Spatial Relations - Spatial Visualization
Domains 1 through 7 feed into the Multicraft portion of the exam; Domains 8 and 9 make up the Spatial Relations portion. Notably, USPS does not publish a percentage weighting per knowledge area - it reports content-area performance only in High, Average, and Low bands on the Notice of Results. That means you can't optimize toward a published weighting scheme; broad competency across all seven Multicraft domains matters more than betting heavily on one area. Our dedicated breakdown, USPS 955 Exam Domains 2026: Complete Guide to All 9 Content Areas, unpacks each domain's likely topics in detail.
Key Takeaway
Because USPS reports scores in High/Average/Low bands rather than percentages, treat every domain as worth studying rather than chasing a supposed "high-weight" section.
Scoring, Passing, and Veterans' Preference
A minimum score of 70, excluding Veterans' Preference points, is required to be considered for any position you apply for. Eligible ratings run from 70 to 100. Veterans' Preference points are added only on top of an already-passing score - they cannot turn a failing score into eligibility. That distinction trips up a lot of candidates who assume preference points act as a safety net; they don't.
For the exact mechanics of how your raw performance becomes a final rating, and what separates a marginal pass from a strong, competitive score, see USPS 955 Passing Score 2026: Exactly What You Need to Pass. If you're trying to gauge realistic expectations before test day, How Hard Is the USPS 955 Exam? Complete Difficulty Guide 2026 and USPS 955 Pass Rate 2026: What the Data Shows are worth reading together.
Retest Rules and How Long Scores Last
Handbook EL-304 sets a 120-day rule for retesting. Entrance applicants who reapply may retake the exam, or reuse an existing score, once 120 days or more have passed since their original test date. In-craft employees testing for a score update follow the same 120-day window before they can reschedule.
Score validity depends on which track you're on. Entrance ratings carry an expiration date printed directly on the Notice of Results, so external applicants need to track that deadline. In-service scores, by contrast, remain valid indefinitely unless the underlying examination requirements change. Full scheduling logistics, including how testing windows open and close, are covered in USPS 955 Exam Dates 2026: Testing Windows, Deadlines & Scheduling.
| Applicant Type | Retest Rule | Score Validity |
|---|---|---|
| External entrance applicant | May retest or reuse score after 120 days | Expires on date printed on Notice of Results |
| Current employee (in-service) | May reschedule score update after 120 days | Valid indefinitely unless requirements change |
Jobs You Can Qualify For
Passing Exam 955 opens the door to a defined set of skilled maintenance craft positions filled through the Maintenance Selection System, including:
- Electronic Technician (PS-10 and PS-11)
- Maintenance Mechanic, MPE
- Area Maintenance Specialist
- Building Equipment Mechanic
- Maintenance Electrician
- Machinist
- Carpenter
- Mason
- Plumber
- Painter
- Blacksmith-Welder
- Letter Box Mechanic
- Building Maintenance Custodian
The specific role you're aiming for can influence how you allocate study time across domains - an Electrician-track candidate benefits from deep focus on Domains 1-3, while a Machinist or Carpenter-track candidate should prioritize Domains 6 and 7. See USPS 955 Jobs for how each craft maps to the exam content, and USPS 955 Salary Guide 2026: Complete Earnings Analysis for how these roles compare once you're hired.
Who Can Take the Exam
There are no formal education prerequisites to sit for Exam 955. It's open to external entrance applicants applying for posted maintenance vacancies, as well as to current USPS employees during the Maintenance Craft in-service open season. That accessibility is part of why the exam draws such a wide range of candidates, from people with hands-on trade backgrounds to those with formal electronics training but no prior postal experience.
If you're checking whether you meet the baseline requirements before you register, USPS 955 Requirements 2026: Eligibility, Prerequisites & How to Qualify walks through the entrance and in-service pathways side by side.
Common Myths, Including the 473 Mix-Up
One persistent source of confusion is USPS Exam 473, a now-retired postal exam that included a Personal Characteristics and Experience Inventory section. Exam 955 has no such section. It consists solely of the Multicraft and Spatial Relations parts described above. Yet many outdated study guides still describe a "personality inventory" or "experience inventory" as part of 955 - that's inaccurate and should be disregarded.
Related short explainers on our site - What Does USPS 955 Stand For?, What Is A USPS 955?, and What Does USPS 955 Mean? - all reinforce the same core identity: a two-part, USPS-administered maintenance skills test with no personality or inventory component.
A Domain-Aware Way to Prepare
Rather than generic study advice, it helps to sequence preparation around the exam's actual structure: seven Multicraft domains plus two Spatial Relations domains, with distinct time pressure in each part.
Electrical Foundations
- AC/DC theory, power distribution basics (Domain 1)
- Motor types, control circuits, and schematic symbols (Domain 2)
Electronics and Test Equipment
- Digital electronics, power supplies, and computer basics (Domain 3)
- Practice reading test instrument outputs under a timer
Fluid Power and Mechanical Systems
- Hydraulics and pneumatics fundamentals (Domain 4)
- Pumps, piping, and combustion principles (Domain 5)
- Power transmission, lubrication, shop tools (Domain 6)
Welding, Rigging, and Spatial Drills
- Welding and rigging terminology and safety concepts (Domain 7)
- Timed Matching Parts and Figures drills (Domain 8)
- Timed Spatial Visualization practice with 3-view solids (Domain 9)
Notice that the last week deliberately pairs the two Spatial Relations domains together, since they share the same 40-minute time block and benefit from back-to-back timed practice. For a more granular week-by-week plan with practice question targets, USPS 955 Study Guide 2026: How to Pass on Your First Attempt extends this framework further. You can also run full-length timed simulations on our practice test platform to get comfortable with the 60-minute Multicraft and 40-minute Spatial Relations blocks before test day.
Key Takeaway
Study the seven Multicraft domains in blocks tied to real trade knowledge, then finish with timed Spatial Relations drills that mirror the actual 40-minute pacing.
If you're still weighing whether investing serious prep time into this exam makes sense for your career goals, Is the USPS 955 Certification Worth It? Complete ROI Analysis 2026 looks at that question directly, and a quick-reference version of everything above is available in the USPS 955 Cheat Sheet 2026: One-Page Review of Must-Know Facts. You can also start practicing immediately with sample questions modeled on the real format at postal955exam.com.
Frequently Asked Questions
No. USPS 955 is a maintenance selection exam administered directly by USPS under Handbook EL-304. There is no fee, and USPS states it never charges for exams, applications, or employment information.
Multicraft has 60 items in 60 minutes, and Spatial Relations has 68 items in 40 minutes, for roughly two hours of total testing time.
You need a minimum score of 70, excluding Veterans' Preference points, to be considered for any position. Eligible ratings range from 70 to 100.
No. That component belonged to the retired Exam 473. USPS 955 consists only of the Multicraft and Spatial Relations sections.
Under Handbook EL-304's 120-day rule, entrance applicants may retest or reuse their score, and in-craft candidates may reschedule a score update, once 120 days have passed since the original test date.