The phrase "and upper grades of" is correct and usable in written English.
It can be used when referring to higher levels or classes in an educational context, typically in relation to school grades.
Example: "The program is designed for students in middle school and upper grades of high school."
Alternatives: "and higher levels of" or "and advanced grades of".
These people, whose origins lay in the salaried middle class and the upper grades of the working class, had been shaped and brought together by the barren world of monopoly industry and centralized government".
Healthy lifestyle curriculum was developed and piloted in upper grades of 30 schools with relevant trainings and guidelines provided to teachers of those schools.
In accordance with the obtained results on fifth-graders and conforming to previous evidences on the upper grades of primary school (Baye and Monseur 2016), the advantage of females over males is larger among low performing students than at the median.
Since 1968 municipalities have offered courses for adults covering the three upper grades of comprehensive school and upper secondary school.
Also, a survey on toothpaste sharing between parents and children reported that 33% of children in the lower grades of elementary school and 53% of children in the upper grades of elementary school shared toothpaste with their parents, with the proportion increasing with age [ 13].
UNICEF also promotes introduction of Life Skills-based education in upper grades of secondary schools with particular focus on HIV/AIDS and healthy lifestyle.
Vocational training in the upper grades of the general school was reinforced.
Participants were 49 students (mean age 11.3 years) from the upper grades of elementary school.
On East 111th Street, the upper grades of Success Academy Harlem 3, a charter school, share a building with Mosaic Preparatory Academy, a traditional neighborhood elementary school.
