Exactly that. It was due to start today and last 4 days, during which they complete their final piece. It meant they missed four days of other lessons but they would have got the full attention of the art teachers in the art department (other art lessons were going to be cancelled). This normally happens every year. I've checked the examining board website (AQA) and it doesn't seem to be specific about how the final piece is carried out. My DC has come back from school very upset--her art teacher told her as a result she might get a lower grade, possibly even not pass. Apparently the head of sixth form told someone this was because "art is not so important as other lessons".