Senior Schools Challenge is for students aged up to 18, with no lower age restriction. In practice the teams tend to draw on Form III to Upper VI (Year 9 to Year 13 in state schools in England & Wales). Each team comprises four members, two of whom must be no older than the normal age for a Form IV (Year 10) student (in 2018–19, born on or after 1 September 2003, or 1 August 2003 in Northern Ireland). The other two can be of any age. Junior Schools Challenge is for students up to and including the normal age for a Form II Year 8) student, or preparatory school pupils: in 2019, born on or after 1 September 2006 (1 August 2006 in Northern Ireland). Again, there are four members in each team but there are no restrictions on the numbers of any students from a particular age group in this competition.