Parmiter's School is a co-educational state comprehensive school with academy status in Garston, Hertfordshire, close to the outskirts of North West London, England with a long history. Although the school admits pupils of all abilities it is partially selective. It is currently the most oversubscribed school in Hertfordshire, and has often been recognised by the Department for Education and Skills (DfES) for being one of the highest-performing schools in the country by value added and score as a mixed-ability school.