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The phrase "at grades ranging from" is correct and usable in written English.
It can be used when discussing a range of academic or performance levels, typically in educational contexts.
Example: "The study included students at grades ranging from kindergarten to eighth grade."
Alternatives: "at levels between" or "across grades from".
Exact(1)
Postoperative complications in the first 90 days were recorded and assessed by the Clavien-Dindo classification at grades ranging from one to five, with higher grades indicating greater severity [ 19].
Similar(59)
This scale contains seven grades ranging from 0 (no symptoms at all) to 6 (death) [ 18].
The N.R.A. has given him grades ranging from C- to F. (It's a tough grader).
Biological labs are given four possible biosafety-level security grades, ranging from BSL-1 to BSL-4.
A wide range of grades, ranging from 0.005 to 0.450, was obtained.
These tumors have a wide spectrum of atypical grades ranging from low-grade dysplasia to invasive carcinoma [19].
defer.add img); Electric breast pumps: These pumps come in many different grades, ranging from hospital grade to small personal pumps.
Classroom sizes in the other elementary grades range from 20 to 25.
Mean grades ranged from 0 – 10.
The grades range from mild (grade 1) to fatal (grade 5).
The grades ranged from 4 ("very poor") to 10 ("excellent").
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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