Moreton Hall and Shrewsbury High School query exam tables
Two independent Shropshire schools claim the government has got their exam results wrong in its annual tables.
Moreton Hall School and Shrewsbury High School have published their versions of the results on their own websites.
Both schools claim their pass rates are significantly higher than those shown in the government league tables.
The Department for Education (DfE) said it was looking at the figures again and schools had the opportunity to check the tables before they were released.
Moreton Hall School in Oswestry said 91% of its pupils received five or more GCSEs but the DfE recorded only 79%.
The independent boarding school said it had contacted the DfE to ask it to review the data.
Shrewsbury High School said the government tables showed that its performance had "plummeted" from the previous year, with only half as many pupils achieving five or more A* to C grade at GCSE.
The private school said it was actually their second-best ever set of results with a 99% pass rate.
It believes the error has come about because the DfE tables are based on there being 165 pupils at key stage 4, whereas the actual number of pupils was 78.
The school said it had raised this with the DfE and are confident that the tables would be revised to show the correct figures.