- What the USPS 955 Actually Tests
- The Nine Content Domains, Section by Section
- Registration, Fees, and the 120-Day Retest Rule
- How Your Score Is Calculated and What "Passing" Means
- Who Actually Hires Through This Exam
- A Domain-Ordered Study Timeline
- Myths and Misreported Facts to Ignore
- Frequently Asked Questions
- USPS 955 has exactly two parts: Multicraft (60 items, 60 minutes) and Spatial Relations (68 items, 40 minutes).
- USPS charges no fee for this exam - any request for payment is a scam.
- A minimum score of 70 (before Veterans' Preference points) is required to be eligible for consideration.
- Content spans 21 technical fields across roughly 131 topics, reported only in High, Average, and Low bands.
What the USPS 955 Actually Tests
USPS Maintenance Exam 955 is administered directly by the United States Postal Service under Handbook EL-304, the Maintenance Selection System. Unlike many workforce assessments, it is not outsourced to a third-party testing vendor - USPS delivers it at approved test centers, on computer, under proctored conditions, and it requires valid photo identification at check-in. There is no fee to sit for the exam, no fee to apply, and no fee for employment information at any stage. If anyone asks you to pay for access to the 955, that is a scam signal the Postal Inspection Service actively investigates.
The exam itself has just two parts, and understanding their structure is the single most important thing you can do before opening a single practice question:
- Multicraft - 60 items in 60 minutes, testing mechanical and electrical job knowledge across the trades USPS maintains.
- Spatial Relations - 68 items in 40 minutes, split between Matching Parts and Figures (choosing the figure that shows loose pieces fitting together without gaps or overlap) and Spatial Visualization (identifying the solid that produces given top, front, and right views).
Total seat time runs roughly two hours. If you want a section-by-section walkthrough of exactly what each domain covers, our complete guide to all 9 content areas breaks it down topic by topic.
The Nine Content Domains, Section by Section
USPS does not publish a percentage weighting for each knowledge area - content performance is reported only as High, Average, or Low. That said, the 21 technical fields and roughly 131 topics behind the Multicraft and Spatial Relations sections map cleanly onto nine practical study domains.
Domain 1: AC/DC Theory, Power Distribution, and Electrical Maintenance
Covers circuit fundamentals, voltage/current/resistance relationships, distribution systems, and troubleshooting electrical faults in maintenance settings.
- Ohm's Law applications in real circuits, not just formulas
Domain 2: Motors, Control Circuits, Schematics, and Print Reading
Tests your ability to read wiring diagrams and control schematics and connect them to how motors actually start, run, and fail.
- Reading ladder logic and interpreting motor control schematics
Domain 3: Digital Electronics, Power Supplies, Computers, and Test Instruments
Blends basic digital logic with practical use of meters and diagnostic tools found on the maintenance floor.
- Multimeter and test-instrument reading scenarios
Domain 4: Hydraulics and Pneumatics
Focuses on fluid power principles used in mail-processing equipment, including pressure, flow, and component function.
- Cylinder, valve, and actuator behavior under pressure
Domain 5: Pumps, Piping and Combustion
Covers pump types, piping systems, and combustion fundamentals relevant to facility equipment.
- Identifying pump and piping configurations from diagrams
Domain 6: Power Transmission, Lubrication, Mechanical Maintenance, and Shop Machines, Tools and Equipment
The broadest mechanical domain, spanning belts, gears, bearings, lubrication schedules, and shop tool use.
- Preventive maintenance logic and correct tool selection
Domain 7: Welding and Rigging
Tests knowledge of welding processes, safety, and rigging fundamentals used in equipment repair and installation.
- Rigging load calculations and welding joint types
Domain 8: Spatial Relations - Matching Parts and Figures
Pure visual reasoning: deciding which assembled figure matches a set of loose, disconnected pieces with no gaps or overlaps.
- Mentally rotating and fitting irregular shapes quickly
Domain 9: Spatial Relations - Spatial Visualization
Requires identifying the 3D solid that would produce a given top, front, and right orthographic view.
- Translating 2D projections into 3D mental models
For a deeper look at how difficult each of these domains tends to feel to real candidates, see our full difficulty breakdown.
Registration, Fees, and the 120-Day Retest Rule
USPS is explicit that it never charges for exams, applications, or employment information - a fact that matters because impersonation scams targeting postal job seekers are common enough that the Postal Inspection Service treats any exam payment request as a red flag. If you're researching how the exam is administered or what it will cost you, the honest answer is: nothing, aside from your own preparation time. Our breakdown of USPS 955 pricing details covers this in full.
Handbook EL-304 also sets a firm retest window: entrance applicants who reapply can retake the exam, or reuse an existing score, once 120 days or more have passed since their original test date. Inservice candidates seeking a score update follow the same 120-day rule before rescheduling. This is a hard scheduling constraint, so if your first attempt doesn't go the way you want, plan your next 120 days deliberately rather than rushing back in. Our testing windows and scheduling guide walks through how to plan around this rule.
How Your Score Is Calculated and What "Passing" Means
To be considered for any position you apply for, you need a minimum score of 70, excluding Veterans' Preference points. 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 result into an eligible one, a distinction that trips up a surprising number of applicants who assume preference points act as a safety net.
Because USPS reports content performance only in High, Average, and Low bands rather than granular percentages, you won't get a domain-by-domain scorecard telling you exactly which of the nine domains cost you points. That's precisely why building domain-level command before test day matters more here than it would on an exam with transparent scoring feedback. Our detailed passing-score walkthrough covers exactly what this threshold means in practice.
| Element | Detail |
|---|---|
| Multicraft section | 60 items, 60 minutes |
| Spatial Relations section | 68 items, 40 minutes |
| Total testing time | Roughly two hours |
| Minimum passing score | 70 (excluding Veterans' Preference) |
| Eligible score range | 70-100 |
| Retest wait period | 120 days |
Who Actually Hires Through This Exam
The Maintenance Selection System feeds a specific set of USPS positions, and knowing your target role helps you weight your study time even without official percentage breakdowns. Positions filled through Exam 955 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 as well as current employees during the Maintenance Craft inservice open season. If you're unsure whether you qualify or which application path applies to you, our eligibility and prerequisites guide lays out both routes, and our overview of jobs filled through the Maintenance Selection System matches roles to the domains that matter most for each.
Key Takeaway
If your target role is electrical (Electronic Technician, Maintenance Electrician), prioritize Domains 1-3. If it's mechanical (Machinist, Carpenter, Building Equipment Mechanic), weight Domains 4-7 heavier. Everyone needs Domains 8-9 regardless of trade.
A Domain-Ordered Study Timeline
Generic study techniques only help if they're mapped onto the actual structure of the 955. Rather than a one-size study calendar, sequence your preparation around the domains most likely to feel unfamiliar first, saving the spatial sections for consistent daily practice throughout since they reward pattern recognition built over time, not last-minute cramming.
Electrical Foundations
- Review Domain 1 (AC/DC theory, power distribution) with basic circuit problems
- Start 10-15 minutes of daily Spatial Visualization practice
Controls and Diagnostics
- Work through Domain 2 print reading and Domain 3 test-instrument scenarios
- Continue daily spatial drills, adding Matching Parts and Figures
Fluid Power and Mechanical Systems
- Cover Domain 4 hydraulics/pneumatics and Domain 5 pumps/piping/combustion
- Mix in full-length timed spatial sets to build speed
Shop Skills, Welding, and Full Simulation
- Finish Domain 6 (power transmission, lubrication, tools) and Domain 7 (welding/rigging)
- Run at least one full timed simulation covering both Multicraft and Spatial Relations
This isn't a rigid four-week mandate - adjust the pace to your available time - but the sequencing logic holds regardless of timeline length: build electrical and mechanical knowledge in blocks while layering spatial reasoning practice continuously, since it's a distinct skill that improves with repetition rather than one-time study. You can build this rhythm using timed drills on our USPS 955 practice test platform, which mirrors the real Multicraft and Spatial Relations format.
Myths and Misreported Facts to Ignore
A lot of outdated material about "USPS 955" circulating online blends in details from the retired Exam 473, most notably references to a Personal Characteristics and Experience Inventory section. Exam 955 does not have this component at all - it consists solely of Multicraft and Spatial Relations. If a study guide walks you through personality-inventory-style questions, you're looking at the wrong exam's material.
Similarly, be skeptical of any resource citing specific pass rates or domain-weighting percentages as if they were official. USPS reports domain performance only in High, Average, and Low bands, with no published percentage breakdown per knowledge area. Anyone quoting exact weighting numbers is guessing or importing figures from an unrelated program. If you want a grounded look at what the available data actually shows, read our analysis of USPS 955 pass rate data before trusting numbers from unofficial sources. And if you're still deciding whether the time investment makes sense for your career goals, our ROI analysis of the certification and earnings guide can help you weigh the decision with real context.
For a condensed, single-page reference you can review the night before test day, our one-page review of must-know facts consolidates the domain list, scoring rules, and format details covered here. And if you're just getting oriented with the exam for the first time, start with our overview of the certification before diving into domain-specific study.
Frequently Asked Questions
Correct. USPS states it never charges for exams, applications, or employment information. Any request for payment tied to the 955 should be treated as a scam and reported.
You need a minimum score of 70, excluding Veterans' Preference points, with eligible ratings ranging from 70 to 100. Veterans' Preference points only add to an already-passing score.
Handbook EL-304 sets a 120-day rule: entrance reapplicants and inservice candidates seeking a score update must wait 120 days from the original test date before retesting or rescheduling.
Yes. Entrance ratings carry an expiration date printed on your Notice of Results. Inservice scores remain valid indefinitely unless examination requirements change.
No. Exam 955 consists only of Multicraft and Spatial Relations. The Personal Characteristics and Experience Inventory belonged to the retired Exam 473 and does not appear on the 955.
Once you understand the exact format, the two-part structure, the 120-day retest mechanics, and the nine domains that actually drive your score, the 955 stops feeling like a mystery test and starts feeling like a preparation checklist. Work the domains you're weakest in first, keep spatial reasoning practice running daily on a realistic practice platform, and treat every other detail as noise.