In 2008, Dr Challoner's High achieved the best A Level results of any Buckinghamshire state school with an A/B pass rate of 84%. At GCSE the A*/A grade pass rate was 81% and over a third of girls achieved all A*/As. The school has appeared in the Times Parent Power school league tables; 31st best state school in 2007, 16th in 2008 and 23rd in 2009, each time being the top state school in Buckinghamshire. Ofsted rated 'Grade 1 – Outstanding' in its last inspection of the school in 2011.