Personally no. My daughters school starts at 830 and teachers are out on the yard at 815 with the buses arriving at 820. Many times I've dropped my daughter off at 815 and there are many kids there already even a bus that arrives early all the time. But in the end the parents have to be comfortable with it. U can only do what u can. So make it clear that u can only drop off 15mins early and leave it to them to decide if that's ok or not.