 The vast majority of pupils at Carre 's continue on to the Sixth Form , and there were 240 students on roll in 2013 . Along with St George 's Academy , Carre 's is part of the Sleaford Joint Sixth Form , which was founded in 1983 and included Kesteven and Sleaford High School until it withdrew in 2010 . It provides a common timetable across both sites and allows for pupils to choose from A @-@ Level options offered at both schools . Pupils may apply to be based at either school , where their pastoral and tutorial activities take place . There are entry requirements based on GCSE attainment . Sixth <unk> can be selected to be prefects , who have responsibilities around the school under the supervision of staff ; they are headed by a Head Boy and Girl . The students are required to wear business @-@ dress ; for males , this consists of a dark suit , a " non @-@ vivid " shirt and the school 's sixth form tie ; females must dress in " smart business wear " . 
