Tour the School
Why not call the school and arrange for you and your child to attend an orientation day or take an informal tour before classes start? Orientation days are important for kids who will be attending a new school, but also helpful for anxious kids who may be able to check out their new classroom, their locker and desk, meet their new teacher and tour the school when it's not packed with other kids.
Some kids might benefit from role-playing school activities with you, especially small children facing their first time going to school. Role-playing gives you the opportunity to model appropriate behaviors while allowing your child to gain confidence and calm fears about anxious situations.