Haley Bosselman editorJemima Kirk, formerly synonymous with her role as the wild, free-spirited Jessa on HBO’s “Girls,” is flipping the script for the students of Moordale Secondary School in Season 3 of “Sex Education,” out Sept. 17.Netflix released a teaser that shows Kirk as Moordale’s new head teacher, Hope Haddon, who aims to to return the school to a pillar of excellence.