it started its transition to become a voluntary-aided sixth form college in 1976. the other three state secondary schools in horsham (forest boys, forest girls and horsham high school for girls) became comprehensives. collyer's had taken its last first form intake in the previous september, and started to expand its sixth form. initially this was done by taking students from the two existing secondary moderns to do o-levels, and girls from horsham high school who wanted to study a-level choices that were not offered by their previous school.