a charitable trust until 2000 when it became a private school. It briefly participated in the Assisted Places Scheme during the 1990s until its abolishment. In 2003, it absorbed the nearby all-girls Butterstone Prep School due to the latter's financial difficulties. Its girls were transferred 22 miles to Kilgraston and one of the boarding houses was named Butterstone after the school. Capital investments have included the opening of a 25m indoor swimming pool complex and upgrades to the equestrian centre (Kilgraston is the only school in Scotland with equestrian facilities on campus) including a 60m x 40m floodlit arena and a new international sized all-weather floodlit hockey pitch. Other developments have been a new theatre with retractable seating for 150, a bistro style dining room, sports pavilion as well as an ongoing upgrade of the residential facilities. As a member of the Network of Sacred Heart Schools, there are exchange and twinning programmes available for girls to interact with fellow students from sister schools around the world. Sixth Form pupils now have access to their own study centre with individual work stations. In 2014, Professor Yellowlees, Chair of the Royal Society of Chemistry and Vice President and Head of the School of Science and Engineering at Edinburgh University, formally opened Kilgraston's £1million Science Centre. In January 2012, Kilgraston was named "Independent School of the Year" ahead of 27 other independent schools across Britain at the Independent School Awards. It was also nominated for the Outstanding Strategic Initiative Award in recognition of the changes the school has made to achieve 55% growth in the last five years and received the Outstanding Financial Initiative prize for its £2m investment in facilities and the introduction of a number of Sports Academies. Academics In 2015, the school was Sunday Times top performing independent school for Highers (H) and Advanced Highers (AH) 2015. In August 2016, 65.5% of grades at AH were A grades against a national average of 33.5%. 90.5% of grades were A-B against a national average of 59.3% and 36% of girls are now studying a STEM undergraduate course. 100% of girls in 2016 were accepted into their choice of university. Boarding Boarding is available to girls aged 8 and above. Approximately half of pupils are boarders, most of whom board on weekdays or on flexible arrangements. The girls reside in three boarding houses: Butterstone and Austin (Junior Years), Mater (Senior School)