M.T.
Bus procedures depend upon your school. In the elementary where I work, it's up to the kindergarten teachers and TA's to get those young students to their buses, the bus drivers aren't responsible for the kids getting on, the classroom staff does. This is a question that you need to ask at your school. You should also ask whether the kids wear seatbelts, whether the kindies must sit in a certain area of the bus and how many kids in a seat.