KS-3 Science

In UK, and other Commonwealth countries, KS (Key Stages) 3 curriculum … the equivalent to middleschool grades 6, 7, 8

 

KS-4 curriculum … the equivalent to junior high school, grades 9-10, and the IGCSE (Edexcel, or Cambridge) at the end

KS-5 curriculum … the equivalent to senior high school, grades 11-12, AS/A-level exam at the end