The phrase "all school levels" is correct and usable in written English.
It can be used when referring to various stages of education, from elementary to high school and beyond.
Example: "The program is designed to support students at all school levels, ensuring that everyone receives the help they need."
Alternatives: "every educational level" or "all grades of education".
Training teachers of all school levels has been a long-term fundamental issue in the Czech Republic.
There are around 9.9m students in the UK across all school levels and in both public and private institutions.
This is important at all school levels.
At all school levels, splendid and exhaustive drawings and environmental models were produced.
In spite of its importance at all school levels, the distinction between L and C is rarely discussed in mathematics education literature.
At all school levels, it is clearly important that students are able to distinguish elements of mathematical theory which are just results of decisions made by people, such as terminology, notation and so forth, from results which have been discovered.
In recent years, there have been an expansion and renewal of the statistics content in the mathematics curricula in many countries through all school grade levels from primary to secondary levels.
In particular for the fourth framing concept, the students at all school levels participated in the classification/systematic exercises.
The "Darwin 2009" project was flexible and adaptable to all ages and school levels (primary school did not take part in the chromosome experience) because it was aimed at building framing concepts and not at "transmitting" information or explanations about evolution; this was possible also without precise previous scientific knowledge.
Data confirm the use of a cutoff of 10% of body weight for the safe use of backpacks for all school levels.
The response on the questionnaire was good and schools of different school sizes and school levels in all regions of the Netherlands were represented.
