The utility-industry aptitude batteries — adaptive practice for the mechanical, math, reading, and spatial skills the EEI tests share.
Utilities hiring for skilled craft roles — line workers, plant operators, meter technicians, gas techs — screen with the Edison Electric Institute batteries: the CAST (Construction and Skilled Trades: graphic arithmetic, mechanical concepts, reading comprehension, and mathematical usage) and the POSS/MASS family for plant operators (figure reading, mechanical concepts, math usage, and reading). Formats vary by battery, but the underlying skills are remarkably consistent: applied mechanical reasoning, fast accurate arithmetic including reading values off drawings and graphs, and technical reading.
Those are trainable skills. Keentune’s adaptive drills build each one — levers, pulleys, gears, and hydraulics for the mechanical sections; rates, percentages, and reading data for the math; close technical comprehension for the reading — meeting you at your level and climbing. If your utility told you which battery you’re taking, weight your practice toward its mix; if not, train all four areas below and you’re covered.
Or take a timed drill — 20 questions, 25 minutes
A focused drill on one section under a real clock — not a full practice exam, and never a predicted EEI CAST & POSS score.
Studying for a test date?
Tell us when your EEI CAST & POSS is — you’ll get a countdown and a daily pace. Create a free account and your date and progress follow you to any device.
Set your test date and we’ll pace your practice to it.
Practice by section
Mechanical concepts
Levers, pulleys, gears, hydraulics, and force problems — the mechanical aptitude core of every EEI battery.
Practice aligned to the skill areas the EEI employment tests measure. Keentune is independent study practice — not affiliated with or endorsed by the Edison Electric Institute or any utility, not a copy of any official test, and no score or job is guaranteed. Your utility’s candidate guide is the authority on your battery’s exact format.
Four paper-and-pencil style sections: graphic arithmetic (read values from a drawing, then compute), mechanical concepts (illustrated mechanical reasoning), reading for comprehension, and mathematical usage. Scores combine into an index your utility uses as a screen — their candidate guide states the current format and timing.
CAST vs POSS vs MASS — which will I take?
It follows the role: CAST for construction and skilled-trades roles, POSS for plant operators, MASS for maintenance. The hiring posting or recruiter tells you which; the mechanical/math/reading core overlaps heavily, so cross-training is efficient.
How do I improve mechanical aptitude quickly?
Drill the classic setups until the principles are reflexes: levers (torque = force × distance), pulleys (count supporting ropes), gears (meshed gears reverse; ratio = teeth ratio), hydraulics (pressure spreads equally). Most EEI mechanical items are one principle applied cleanly — recognizing WHICH principle is the skill.
All exam, test, and product names and trademarks are the property of their respective owners and are used here for identification and reference only. Keentune is independent study practice — not affiliated with, authorized, or endorsed by any of these organizations.