- "USPS 955" refers to Exam 955, the number USPS assigns to its Maintenance Selection System exam under Handbook EL-304.
- It is not a third-party certification - USPS administers it directly at approved test centers, with no fee ever charged.
- The exam has exactly two parts: Multicraft (60 items, 60 minutes) and Spatial Relations (68 items, 40 minutes).
- Passing requires a minimum score of 70, with eligible ratings ranging from 70 to 100.
What "USPS 955" Actually Stands For
"USPS 955" does not stand for an acronym or a phrase - it stands for a specific exam number. The United States Postal Service assigns numeric identifiers to its various pre-hire and in-service assessments, and "955" is the number designated to the Maintenance Selection System exam. When people search "USPS 955," they are almost always looking for information about this maintenance-track assessment, not a spelled-out abbreviation.
The exam is administered by USPS itself, governed by Handbook EL-304, the Maintenance Selection System. That handbook is the official rulebook covering everything from eligibility to retest timing. If you're just getting oriented, the companion piece What Is USPS 955? walks through the basics in more depth, and USPS 955 Meaning unpacks the naming convention further.
Why It's Not a Vendor Certification
A lot of confusion around "USPS 955" comes from assuming it functions like a private-sector credential you pay to earn. It doesn't. USPS is explicit that it never charges for exams, applications, or employment information. If anyone asks you to pay a fee to take Exam 955 or to receive results, that is not a legitimate USPS process - the Postal Inspection Service treats requests for exam payment as an employment scam.
This matters for how you should think about the name. Exam 955 isn't a badge you purchase or a certification you renew through a private body; it's an internal USPS assessment tool used to rank candidates for maintenance craft positions. For a fuller breakdown of what the "certification" framing does and doesn't mean, see USPS 955 Certification and What Is USPS 955 Certification?.
Key Takeaway
Never pay anyone for access to Exam 955, study materials packaged as "official," or promises of a guaranteed passing score - USPS itself charges nothing for the exam process.
The Two Parts Behind the Name
Once you understand that "USPS 955" refers to a specific exam, the next logical question is what's actually inside it. The official USPS Assessment Information Package for Exam 955 defines exactly two parts, taking roughly two hours combined:
- Multicraft: 60 items in 60 minutes, assessing mechanical and electrical job skills relevant to maintenance craft work.
- Spatial Relations: 68 items in 40 minutes, split into two question types - Matching Parts and Figures, and Spatial Visualization.
In Matching Parts and Figures, you decide which figure shows how a set of loose pieces fit together without gaps or overlap. In Spatial Visualization, you determine which solid object would produce the top, front, and right views shown in the question. These are visual reasoning tasks, not memorization tasks, which is part of why generic test-prep advice often falls short here.
For a deeper walkthrough of how questions are formatted and what a testing session actually feels like, the USPS 955 Study Guide 2026: How to Pass on Your First Attempt is a good next stop.
The Nine Content Domains
The two parts of Exam 955 draw from content organized into nine domains that candidates should recognize by name. USPS content is actually drawn from 21 technical fields covering roughly 131 topics, but those fields map onto nine broader domains that structure most preparation:
Domain 1: AC/DC Theory, Power Distribution, and Electrical Maintenance
Foundational electrical concepts that show up across multiple Multicraft items.
- Circuit fundamentals and distribution basics
Domain 2: Motors, Control Circuits, Schematics, and Print Reading
Interpreting diagrams and understanding how motor control systems operate.
- Reading schematics under time pressure
Domain 3: Digital Electronics, Power Supplies, Computers, and Test Instruments
Modern electronic systems and the instruments used to diagnose them.
- Recognizing test instrument functions
Domain 4: Hydraulics and Pneumatics
Fluid power principles used in mail-processing equipment maintenance.
- Pressure, flow, and component behavior
Domain 5: Pumps, Piping and Combustion
Mechanical systems involving fluid movement and combustion processes.
- Piping configurations and pump types
Domain 6: Power Transmission, Lubrication, Mechanical Maintenance, and Shop Machines, Tools and Equipment
A broad, tool-heavy domain covering everyday mechanical maintenance skills.
- Shop tool identification and use
Domain 7: Welding and Rigging
Joining and lifting techniques relevant to facility maintenance work.
- Rigging safety fundamentals
Domain 8: Spatial Relations - Matching Parts and Figures
Directly tied to the Spatial Relations section's first question type.
- Visualizing how loose pieces combine
Domain 9: Spatial Relations - Spatial Visualization
Matching a solid object to its top, front, and right views.
- Mental rotation practice
USPS reports content-area performance only in High, Average, and Low bands and does not publish a percentage weighting per knowledge area, so treat any source claiming exact percentage breakdowns with skepticism. For an expanded domain-by-domain study approach, see USPS 955 Exam Domains 2026: Complete Guide to All 9 Content Areas.
Who Uses This Exam and Why
Exam 955 is not tied to one job title - it's the entry gate for a whole family of maintenance craft positions. Roles filled through the Maintenance Selection System include 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, and Building Maintenance Custodian.
There are no formal education prerequisites to sit for the exam. It's open to external entrance applicants and to current employees during the Maintenance Craft in-service open season. If you're mapping out whether you personally qualify, check USPS 955 Requirements 2026: Eligibility, Prerequisites & How to Qualify, and if you're curious how the exam translates into an actual career path, USPS 955 Jobs and USPS 955 Salary Guide 2026: Complete Earnings Analysis cover that ground.
| Exam Component | Items | Time |
|---|---|---|
| Multicraft | 60 | 60 minutes |
| Spatial Relations | 68 | 40 minutes |
How the Name Connects to Scoring
Understanding what "USPS 955" stands for also means understanding how it produces a usable number for hiring. A minimum score of 70, excluding Veterans' Preference points, is required to be considered for any position applied for. Eligible ratings run from 70 to 100. Veterans' Preference points are added only to already-passing scores - they cannot turn a failing result into an eligibility.
Handbook EL-304 also sets a 120-day retest rule. Entrance applicants who reapply may retake the test or reuse their existing score if they apply 120 days or more after taking it. Incraft candidates testing for a score update may reschedule 120 days after the original exam date. Entrance ratings carry an expiration date printed on the Notice of Results, while inservice scores remain valid indefinitely unless examination requirements change.
Common Misunderstandings About the Name
Because "USPS 955" is a short, generic-sounding string of numbers and letters, it gets confused with several unrelated things - including other credentials that happen to share a similar label in unrelated industries. When researching, make sure any source you're reading is specifically about the USPS Maintenance Selection System exam under Handbook EL-304, not a different certification that coincidentally uses the same numeral.
Another persistent myth is that Exam 955 includes a Personal Characteristics and Experience Inventory section. It doesn't. That component belonged to the retired Exam 473 (used for city carrier and clerk positions), and it is still misreported by many outdated study guides. Exam 955 consists strictly of the Multicraft and Spatial Relations sections described above - nothing more.
You'll also see conflicting claims about cost. To be direct: USPS charges no fee for Exam 955. Any listing that references an "exam fee" as an official USPS charge is describing something else. See USPS 955 Certification Cost 2026: Complete Pricing Breakdown for a clear accounting of what does and doesn't cost money in the overall hiring process.
Key Takeaway
If a study resource mentions a Personal Characteristics inventory or a paid exam fee for Exam 955, treat that resource as outdated or inaccurate.
Turning the Name Into a Study Plan
Once the name and structure are clear, preparation becomes a matter of allocating time proportionally across the nine domains, weighting technical review toward Multicraft and visual practice toward Spatial Relations. A simple multi-week approach works well because it lets you rotate through dense technical domains before consolidating with timed practice.
Electrical Foundations
- Review Domains 1-3: AC/DC theory, motor controls, digital electronics
Mechanical Systems
- Review Domains 4-7: hydraulics, pumps, power transmission, welding and rigging
Spatial Reasoning
- Drill Domains 8-9 with timed Matching Parts and Spatial Visualization sets
Full Simulation
- Run full-length, timed practice covering both Multicraft and Spatial Relations
Full-length timed practice matters because both sections have strict time limits - 60 minutes for 60 Multicraft items and 40 minutes for 68 Spatial Relations items. Practicing under similar time pressure on a full-length practice test helps you calibrate pacing before test day. For a broader sense of how difficult candidates generally find each section, How Hard Is the USPS 955 Exam? Complete Difficulty Guide 2026 and USPS 955 Pass Rate 2026: What the Data Shows provide useful context, and USPS 955 Cheat Sheet 2026: One-Page Review of Must-Know Facts is handy for last-minute review.
If you're still deciding whether pursuing a maintenance craft position through this pathway fits your goals, Is the USPS 955 Certification Worth It? Complete ROI Analysis 2026 lays out the considerations, and USPS 955 Training covers preparation resources beyond self-study. You can also start building familiarity with the question formats directly through our practice platform before committing to a full study schedule.
Frequently Asked Questions
No. It's simply the exam number USPS assigns to the Maintenance Selection System assessment under Handbook EL-304. It is not an acronym.
No. USPS states it never charges for exams, applications, or employment information. Any request for payment tied to Exam 955 should be treated as a scam.
No. Exam 955 has only two parts, Multicraft and Spatial Relations. The Personal Characteristics and Experience Inventory belonged to the now-retired Exam 473.
Handbook EL-304 sets a 120-day rule: entrance applicants may reapply and retake or reuse their score 120 days or more after their original test date, and incraft candidates seeking a score update follow the same 120-day interval.
There are no formal education prerequisites. It's open to external entrance applicants at any time postings are active, and to current employees during the Maintenance Craft in-service open season.