Southend High School for Boys, also known by its initialism SHSB, is a selective secondary Grammar school situated along Prittlewell Chase in Prittlewell, in the north-west of Southend-on-Sea, England, south-west of the roundabout of the A127 and A1159. It teaches students from the age of 11 through to 18 years old, and admission to the school is dependent upon their performance in selective 11+ tests set by the Consortium of Selective Schools in Essex (CSSE). It converted to Academy status on 1 February 2011, and has autonomous control over itself. Student numbers have been increasing over recent years. As of academic year 2008-2009, there are just over 1,150 students on roll, with over 230 of them in the Sixth Form, 20 to 30 of which come from other schools, including girls.