This POSS cheat sheet strips the EEI Plant Operator Selection System down to the formulas, mechanical rules, and section timing that decide your Aptitude Index. It's a premium cheat sheet built by Capital Prep — the one premium prep we trust — and it's yours free. Back it with the rest of your free POSS toolkit: the practice test, study guide, and flashcards.
POSS exam at a glance
- Tests: 4 separately timed sections — Reading Comprehension, Mathematical Usage, Mechanical Concepts, Figural Reasoning
- Questions: Up to 146 on the long form (about 118 on the short form)
- Section time: About 77 minutes of testing (roughly 2.5 hours on site with instructions)
- Scoring scale: Correct answers combine into an Aptitude Index of 0–15 (no guessing penalty)
- Passing: No universal pass mark — each utility sets its own Index cutoff and ranks candidates
- Cost: No fee to candidates; the hiring utility pays as part of the process
What’s on the POSS cheat sheet
- Mathematical Usage (≈31%) — the by-hand formulas and conversions — part = percent × whole, percent change over the original, ratios by cross-multiplying, and distance = rate × time.
- Mechanical Concepts (≈30%) — pulley, lever, and gear rules plus hydraulics (force = pressure × area), friction, flywheels, and common plant equipment.
- Reading Comprehension (≈25%) — main-idea versus detail tactics, inference discipline, and following written procedures — every answer lives in the passage.
- Figural Reasoning (≈14%) — picture-series, rotation, and reflection patterns — isolate the one rule that changes and apply it one more step.
How to use it in your final week
- Drill the math conversions until they're reflex — minutes ÷ 60 to hours, ¾ = 75%, part = percent × whole, distance = rate × time — since Mathematical Usage is solved by hand with no calculator.
- Memorize the four mechanical rules: pulley effort = load ÷ supporting rope segments, lever balance = effort × effort-arm = load × load-arm, gear ratio = driven ÷ driver teeth, and hydraulic force = pressure × area.
- Rehearse the clock, not just the content — run a full section-timed pass so 44 mechanical items in 20 minutes and 20 figural items in 10 minutes feel routine, because pacing is what trips most candidates.
- Read the sheet the morning of the test for a final pass, and remember there's no guessing penalty — mark an answer for every question before each section's time runs out.
The cheat sheet is your review layer — your POSS practice test drives the exam-readiness ring at the top of this page. Download it, review, then take a full practice exam (or drill with the study guide and flashcards) to see where you stand.
POSS cheat sheet FAQ
Yes — the POSS cheat sheet downloads as a PDF with no sign-up and no payment. It's part of Career Employer's free EEI Plant Operator Selection System toolkit, right alongside the practice test, study guide, and flashcards.
It condenses the four timed POSS tests into a single quick reference: the math formulas and conversions you solve by hand, the mechanical rules for pulleys, levers, gears, and hydraulics, reading-comprehension attack tactics, and the figural-reasoning patterns — plus each section's question count and time limit.
Right — the POSS produces a single Aptitude Index from 0 to 15, and each utility sets its own cutoff, so there's no universal pass mark. The cheat sheet keeps the highest-yield facts at your fingertips so you convert every correct answer possible and push your Index as high as you can, since utilities rank candidates by it.
No — the cheat sheet is a cram and review layer, not a full course. The POSS is won on speed under strict per-section clocks (like 20 figural items in 10 minutes), so pair the sheet with timed practice tests to build the pace, then use the sheet to lock the formulas and rules in place.
Click the download button or the preview card at the top of this page and the PDF opens instantly. Bookmark this page so you can pull the sheet back up for one last review the morning of your utility's test.
References
- 1.Edison Electric Institute. “Plant Operator Selection System (POSS) Testing Brochure.” Edison Electric Institute, 2026. ↑
- 2.Edison Electric Institute. “EEI's Employment Test Batteries.” Edison Electric Institute, 2026. ↑
- 3.PSEG. “Plant Operator Selection System Test Brochure (EEI mirror).” corporate.pseg.com, 2026. ↑
Career Employer
Career Employer is the ultimate resource to help you get started working the job of your dreams. We cover topics from general career information, career searching, exam preparation with free study materials, career interviewing, and becoming successful in your career of choice.
All PostsCareer Employer’s Editorial Process
Here at Career Employer, we focus a lot on providing factually accurate information that is always up to date. We strive to provide correct information using strict editorial processes, article editing, and fact-checking for all of the information found on our website. We only utilize trustworthy and relevant resources. To find out more, make sure to read our full editorial process page here.