Inspectors – who visited the school in November- delivered a glowing assessment of the transformation taking place.
Pru Rayner, of Ofsted, said leaders were relentless in improving teaching by developing different ways of working to support pupils.
She said: “The assistant principal responsible for mathematics has transformed the approaches to how it is taught. Pupils say they understand much better what they need to do and are more confident in their learning.
“Ninety Year 11 pupils are attending extra catch-up sessions, three mornings a week, and extra tuition is also given on Saturdays."
“Already nearly half of all pupils, including the disadvantaged pupils, attending these sessions have progressed by at least a GCSE grade,” she said.
