1. Do they study at the Medical College? (общий)
They study at the Medical College, don't they? (разделительный)
Who studies at the Medical College? (к подлежащему)
Do they study at the Medical or Agricultural College? (альтернативный)
Where do they study? (специальный)
2. Ошибка: ед.число - a class, мн.число - classes
Does she go shopping after classes?
She goes shopping after classes, doesn't she?
Who goes shopping after classes?
Does she go shopping or skating after classes?
When does she go shopping?