Primary school league tables will go ahead in March after the failure of a High Court bid to block them.
West Horndon primary school, near Brentwood in Essex, claimed the tables would be distorted because children with special needs would be included in the percentage figure indicating the overall success rate.
Cherie Booth QC, acting for the school and the National Association of Head Teachers, added that other distortions would be caused because 11-year-olds who missed tests because of absence would be recorded as having a zero score. Applying for leave to seek a judicial review, she said many other schools would also be affected.
Mr Justice Harrison said that the Secretary of State had not been shown to have acted unreasonably or perversely.
West Horndon head Viv Wakeham said: "I am very disappointed that the information parents will receive in the league tables will be so misleading. This will not in any way help them to make informed choices about their child's school."