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The phrase "a test on a" is correct and usable in written English.
It can be used when referring to an examination or assessment focused on a specific subject or topic.
Example: "The teacher announced that there would be a test on a chapter from the textbook next week."
Alternatives: "an exam about a" or "an assessment on a".
Exact(46)
More than a decade ago, a medical examiner neglected to order a test on a dead patient that investigators now say might have stopped Mr. Cullen.
A new group would take a test on a computer.
He began gingerly, performing a test on a tiny portion, removing varnish with an organic solvent.
Atkinson has clients do a test on a treadmill or exercise bike while wearing a monitor.
Our aim was to determine the reliability of HR recovery after a test on a cycle ergometer.
How smooth is that transition going to be? Twenty-two drivers put that question to a test – on a track, not a freeway – to find out.
Similar(14)
Every internal node represents a test on an attribute value whereas every branch depicts an outcome of the test.
● The receiver performs a test on an observed scanned code, being either the scanned version of the original printed code or the scanned version of the fake code.
However, hospitals may not perform such a test on an unconscious patient.
You see this with the iPad fiasco; a primary function of them was to get kids ready to take a test on an iPad.
In addition, we performed a preliminary test on-board a quadcopter.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com