UK IB School Ranking (by Cohort Size) Avg. Name Day/Board Boy/Girl Day £ Board £ Cohort Points Sevenoaks School Both Co-ed 24,516 37,404 205 39.6 United World College of the Atlantic Both Co-ed 168 35 St Clare's - Oxford Both Co-ed 17,967 37,052 115 35.9 King Edward's School (Boys) - Birmingham Day Boys 12,375 111 39.2 ACS Cobham International School Both Co-ed 25,680 44,360 97 29.9 Wellington College - Berkshire Both Co-ed 27,120 37,110 91 38.9 King's College - Wimbledon Day Co-ed 20,400 72 41.5 Oakham School - Rutland Both Co-ed 19,350 31,575 60 37.2 Haileybury - Hertford Both Co-ed 23,802 31,674 58 37.4 Southbank Intl School - Westminster Annexe Day Co-ed 27,660 55 35 St Leonards School - Fife Both Co-ed 13,137 32,040 54 34 King Edward's Witley Both Co-ed 19,950 29,595 51 33.4 TASIS - The American School in England Both Co-ed 22,510 39,500 50 33.9 King William's College - Castletown Both Co-ed 21,036 30,435 49 32.2 Ardingly College - Haywards Heath Both Co-ed 23,160 32,130 47 39 Marymount International School Both Girls 22,035 37,360 44 36.3 Christ's Hospital - Horsham Both Co-ed 20,490 31,500 39 36.6 ACS Hillingdon International School Day Co-ed 23,110 39 31.9 ACS Egham International School Day Co-ed 24,020 38 35.5 Felsted School - Essex Both Co-ed 22,125 32,985 37 33.9 Cheltenham Ladies' College Both Girls 26,220 38,670 36 40 Scarborough College - N. Yorks Both Co-ed 13,785 26,697 33 29.7 Fettes College - Edinburgh Both Co-ed 25,545 32,340 32 37.3 Windermere School Both Co-ed 16,920 29,970 31 33.5 Bromsgrove School Both Co-ed 15,420 33,855 30 38 Gresham's School - Norfolk Both Co-ed 24,900 34,170 29 35 Taunton School Both Co-ed 18,375 34,050 28 33 Worth School - Crawley Both Co-ed 22,050 31,140 27 35.8 North London Collegiate School - Edgeware Day Girls 19,062 26 41.7 Brentwood School Both Co-ed 17,400 34,135 26 36.8 Bedford School Both Boys 18,027 30,489 26 36.4 International School of London, London Day Co-ed 26 33.5 Portsmouth Grammar School Day Co-ed 14,817 25 38.7 Stonyhurst College - Clitheroe Both Co-ed 18,615 33,429 25 36 Box Hill School - Dorking Both Co-ed 18,300 32,400 25 32.3 Charterhouse School Both Co-ed 30,387 36,774 24 38.8 CATS College Canterbury Both Co-ed 23,730 36,600 24 31.3 Headington School - Oxford Both Girls 17,970 35,250 23 39.3 Hurstpierpoint College Both Co-ed 22,185 32,970 23 38 Rossall School - Lancashire Both Co-ed 12,450 35,550 22 31 Whitgift School - Croydon Both Boys 18,618 35,522 21 40.7 Stephen Perse Foundation - Cambridge Day Co-ed 15,975 21 40.2 Kent College - Canterbury Both Co-ed 17,691 33,480 21 35.5 Source: Best-schools.co.uk.