The head of a school taken to court over an expulsion said the pupil faced more punishments in two weeks than most pupils in their entire school career.
Russell Gray is challenging the expulsion of his son, Rhys
Nicholas Sampson, head of Marlborough College, described in a statement to the court the expelled pupil's "appalling behaviour" and bullying.
The 16-year-old pupil's father, Russell Gray, has taken legal action against the expulsion of his son, Rhys.
He has challenged the school's refusal to admit Rhys to the sixth form.
Mr Gray told Southampton County Court that it was convenient for the school to remove Rhys after GCSEs were taken, because "there's a ready stock of potential sixth form students".
"Getting rid of him at an earlier stage would leave a gap in their coffers.
"The combination of mediocre results according to the school's confident expectation and mediocre, poor behaviour, doesn't represent an attractive package, particularly when there's a queue of people outside the door ready to switch in with him at that particular time," said Mr Gray.
But Mr Sampson, head teacher of the independent Wiltshire school, told the court that Rhys distracted and disrupted other pupils - and that his level of effort was "the lowest I or any of his masters can recall".
Among examples of bad behaviour, he said Rhys had been sent back early from an activities week in Wales for his "appalling" behaviour - including bullying, exposing himself, refusing to apologise and refusing to join in exercises.
The head said that he had written to the boy's father to warn him that "Rhys should be withdrawn from Marlborough after his GCSE examinations" and that "we would probably not allow his son back".
"Unfortunately Mr Gray appeared to trivialise Rhys's behavioural problems," said the head teacher.
Richard McManus QC, representing Mr Gray, said the parent had believed warnings about whether Rhys would stay at the school were based on his predicted GCSE grades and not his behaviour.