Depends on the size of the school (and the staying on rate). Small sixth forms aren't able to offer a wide range of subjects, but larger ones can. I know that JFS, which has something like 2,000 kids, has a huge range at A-Level.
Also some kids benefit from the continuity and atmosphere; some kids aren't ready for the relatively unstructured atmosphere of a college, and do better with another 2 years at school.
(no subject)
Also some kids benefit from the continuity and atmosphere; some kids aren't ready for the relatively unstructured atmosphere of a college, and do better with another 2 years at school.