For some, you may be lucky in receiving study leave in year 12, for others, you may not receive it, depending on your school.
My study leave begins on Friday 13th May to Monday 13th June so essentially a whole month off. As I do a Cambridge Technical alongside my A Levels which is 100% coursework based, I still have to attend those lessons (providing I finish all my coursework beforehand as I can therefore not attend the lessons then) and also my GCSE Maths re-sit lessons.
For year 13, after May half term, you will have left school but this is of course dependent on the school and any outstanding work left to complete.