I am teaching A level chemistry to a class of 30 students (I am on a full teaching timetable ages: 12-18). School decided not to split the class. Carrying out practical work is very difficult, not only because I do not have sufficient equipment for some practicals, but because of H&S issues with so many students in a small classroom. I have tried splitting the class between practical work and study, however this is increasing the teaching time considerably and there are problems finding extra classrooms and teachers. The volume of marking is also demanding and providing 1:1 support very difficult. Any ideas?