In the United Kingdom, the national curriculum is organised into blocks of years called "Key Stages". Key stages have no legal definition and are merely used as indicators to complement the defined key stages. At the end of each key stage, students are required to complete standard assessment tasks.
- KS0: Early years foundation stage for pupils of age 3 to 5 (Nursery & Reception)
- KS1 &2: Primary school education. All students take SATS (Standard Assessment Tests).
- KS3: Secondary school education.
- KS4: At the end KS4 pupils sit in GCSE (General Certificate of Secondary Education) examinations or O-Levels or other national qualifications.
- KS5: Sixth form secondary, FE College A-Levels, AS-Levels, NVQs, Diplomas.
Rough guide to US school grades compared to UK school years