About the Key Stages
0	Preschool
1	5 to 7 year olds Years 1 and 2
2	7 to 11 year olds Years 3, 4, 5 and 6
3	11 to 14 year olds Years 7, 8 and 9
4	14 to 16 year olds Years 10 and 11
5	16 to 18 year olds Years 12 and 13