I already submitted my application for 3 A-levels in november, but recently i have realised i would like to do a fourth. I have spoken to my subject teacher about it but i havent heard back about what i should do about it. Would it be ok to wait until September and then ask to join the course, or should i contact my school's post-16 team before the summer holidays start? i just want to be sure that i definitely get on the course. Thanks!