The school caters for girls between the ages of 11 and 18, teaching all to GCSE and a large proportion to A-level.

To be accepted to Parkstone Grammar School all girls are required to sit an entrance test Founded in 1905 as a co-educational school at Ashley Cross in Parkstone by William Ernest Brennand.

The first headmistress, Miss W. M. Allen, was in post from 1937, just before the reorganisation, until 1959, by which time the current site at Sopers Lane had been chosen.

Anne Shinwell was headmistress from 2001 to Easter 2013 when she retired and her position went to Tracy Harris.

After extensive discussions on the matter lasting a few years the school re-implemented a house system on 18 November 2015, after letting it lapse after its usage in the 1970s.