The father of a pupil at an exclusive private school plans to sue over its attempts to expel the boy.
Rhys Gray says his 400 misdemeanours are minor
Rhys Gray, 15, from London, has been a student at Marlborough College in Wiltshire for three years.
But the school has said it does not want him to return to the sixth form in September because of a poor disciplinary record.
Rhys' father is taking the college to court to try to stop it barring the teenager from returning.
Property developer Russell Gray believes the £7,300-a term college is more concerned with league tables than his son's educational wellbeing.
He said: "We are bringing the case quite simply because we feel we've been unfairly treated and because it's a product of an over-reaching power that private schools generally seem to be exerting."
And his son says that the 400 misdemeanours he is being punished for are all relatively minor.
"It was chewing gum, forgetting books, stuff like that," he said.
He added that he had been caught smoking and once disciplined for having beer.
"They see that as being unwilling to profit from the educational opportunities Marlborough offers.
"That's what they say anyway - I think they just want to get rid of me because I won't be any use in the new league tables, which is not very fair."
A trial date has been set for September, by which time Rhys will know the outcome of his GCSE results.
He said outside court that he is predicted between A* and Cs in his 10 subjects.
Rhys said the results should academically warrant him being accepted into the sixth form to do his intended A-Levels of Physics, Chemistry and Maths.
"If I'm not going to get all A-stars, there is no point dealing with someone who is not impeccably behaved," claimed Rhys.
Asked if he was confident of getting good GCSE grades, he said: "Yes, definitely."
A spokesman for the school said there would be no comment on the case until after the trial.