We did for GCSEs, 4 weeks before exams started. For AS/A2 (the rules changed just as my year went to sixth form) we did get it, and lessons ended, but we still had to go to our timetabled rooms each lesson, just with revision materials, and the teachers enforced silent revision. Silence makes me really anxious, so this was awful for me, and I'd have made much better use of my time at home.