On OER Commons we use a broad set of education levels to describe resources, rather than listing a specific grade. This improves the portability of data as grade-level requirements can vary widely from location to location. Using general categories, such as Lower Primary rather than Grade 1, improves the accuracy of resource descriptions.  

Level
Sub-Level
Grade
Primary
Preschool
Birth to PreK
PK
Lower Primary
Grade K
Grade 1
Grade 2
Upper Primary
Grade 3
Grade 4
Grade 5
Secondary
Middle School
Grade 6
Grade 7
Grade 8
High School
Grade 9
Grade 10
Grade 11
Grade 12
Post-Secondary
Community College / Lower Division
 
College / Upper Division
 
Graduate / Professional
 
Career / Technical