Pupils at a Doncaster primary school face having their SATs papers torn up after an investigation was launched into the administration of the tests.
Results for exams sat by Year 6 pupils at Barnby Dun Primary Academy in May have been withheld after concerns were raised about the handling of the tests.
The Standards and Testing Agency confirmed an investigation was under way but said no decision had yet been taken.
Frustrated parents say they have been kept in the dark as to the reason results were not given back in July.
And, five months on, parents are demanding answers.
Alison Jordan, whose 11-year-old son is amongst those waiting for results, said: “Parents are getting so frustrated with the whole thing – we just keep getting fobbed off.
“We’ve heard all sorts of rumours about staff giving pupils assistance and the school is certainly not helping dispel rumours by refusing to provide us with an explanation.”
Mrs Jordan is concerned that her son - who has now moved to secondary school - will be disadvantaged as the new school has no indication of what level he is working at.
She added: “It’s dispiriting for the children to think they’ve worked really intensively for a year, with staff constantly telling them how important these tests are, for them to be cast aside.”
A Standards and Testing Agency spokesperson said: “We are currently investigating the administration of the 2014 Key Stage 2 National Curriculum tests at Barnby Dun Primary Academy in Doncaster.”
No comment was available from the school.