Primary Key Stages

Key stages refer to the sets of skills and knowledge a student is aiming to develop at a certain stage in its education.
In short:

Years 1 and 2 are in Key Stage 1
Years 3, 4, 5 and 6 are in Key Stage 2

Key Stage 1 includes students at the age of 5 to 7 years of age. The core subjects are mathematics, English and science. Students are expected to be able to read when they leave this key stage as well as be able to do basic additions and subtractions. Socially, students are expected to be able to listen to instructions and show some understanding for what a good buddy is in classroom work and in the playground.
Key Stage 2 is designed for students aged 8 to 10. The core subjects remain English, mathematics and science. Literacy skills now move towards reading for meaning and teaching students how to produce reports, recounts, instructions and stories in writing. Students are expected to be able to do short spoken presentations and explanations of their work.