# Key Stage 1 - 5 to 7 years old -infant school (often part of primary school , czasami podaje sie 4 ale dziecko musi skonczyc 5 lat w tym roku szkolnym)
# Key Stage 2 - 7 to 11 years old - primary school
# Key Stage 3 - 11 to 14 years old - secondary school
# Key Stage 4 - 14 to 16 years old - secondary school