For pupils who live in England, the Government website explains that after year 11, you must do one of the following until you are 18 years old:-

•         Stay in full-time education, for example, Sixth Form in a school or go to College
•         Start an apprenticeship or traineeship
•         Spend 20 hours or more a week working or volunteering, while in part-time education or training

For further information, please go to https://www.gov.uk/know-when-you-can-leave-school