Some children seeking a place at Antrim Grammar School have received their transfer test results a day early due to a "mailing error".
Transfer tests are used as entrance exams by about 60 post-primary schools.
Children who sat the transfer tests run by the AQE or PPTC testing organisations are due to get their results on Saturday.
But some who sat the PPTC test, also known as the GL Assessment test, got results from Antrim Grammar on Friday.
In a statement released through the Education Authority, the school said that "due to a mailing error some parents will have received their child's GL Assessment results a day early".