Just to clarify this as well, while sixth form (17~18 years old) is optional in the UK, education is still compulsory until you're 18. you have the option to do this at an apprenticeship or skills based school but lots of people do just default to a levels.
> in the UK, education is still compulsory until you're 18
I've just looked it up because I hadn't heard this - it was only compulsory until 16 "in my day"! Turns out it still is, here in Wales, and also Scotland and NI. Only England changed it to 18. Our devolved governments love to make things confusing.
