King William's College is a co-educational senior school catering for day pupils and boarders and delivers GCSEs and the International Baccalaureate. The grounds are first class and provide excellent sporting facilities for a wide range of disciplines. Class sizes are small throughout and often in single figures for specialist subjects. Named as Sunday Times IB School of the Year 2008/09.
King William's College has a total of 371 pupils, with 109 pupils in the Sixth Form.