MALVERN College headmaster Hugh Carson is furious that A'Level result tables published in national papers have failed to include International Baccalaureate results - as previously agreed.
Mr Carson says that leaving out the IB results meant the school appeared a lot lower down the tables than it should.
"Many of our brightest pupils take the IB as an alternative to A'Levels, which we also offer, and if their results are excluded it completely distorts the picture," he said.
"If the IB figures had been included, as had been agreed with the Independent Schools Council Information Service, Malvern College would be over 100 places higher than has been stated.
"Other schools that offer the IB, which is welcomed by universities, have been similarly disadvantaged."
A total of 75 pupils took the IB at Malvern College this year, averaging an A'Level equivalent grade of better than ABB.
The International Baccalaureate, which was founded in Switzerland in 1968, allows pupils to take six subjects. These include maths, their own language, a foreign language, an arts subject, a science subject and one other.
Mr Carson said: "The IB is more of a challenge and provides a broader education, it helps break down the barriers between the two cultures of arts and sciences."
Dick Davison, joint director of the ISCIS, said he sympathised with Mr Carson and said the problem came about because the admissions service UCAS had not yet integrated the IB into its results service.
UCAS spokeswoman Sue Montague said the body was actively working with the IB authorities to incorporate IB scores into the A'Level tariffs.
She said the tariffs were designed to streamline university admissions procedures, not construct league tables.
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