"educational levels" is correct and usable in written English.
For example, you could say "The data showed that educational levels in the area were increasing."
Working in groups with different educational levels enriches the interaction and education among students.
All other educational levels were categorized as "high education".
Maybe educational levels are like Willie Wonka's chocolate bars.
American Muslims have instead overwhelmingly signed up for the American Dream, enjoying higher incomes and educational levels than the average.
Professors Parente and Prescott came to their bold conclusion after examining alternative explanations, like savings rates or educational levels.
Carers in low socio-economic groups, immigrant populations, and those with low educational levels are at higher risk.
The U.S. border region tends to have lower educational levels and fewer job opportunities than other parts of the country.
Translate these figures into a chart that graphically compares the educational levels attained by a few select age groups.
Maintaining excellence at the highest educational levels requires sustaining the pipeline from the lower levels.
In general, developing countries' educational levels have soared in the past decade or so.
I make comparable assignments for all educational levels.
