Visit your child's future primary classroom prior to the start of the school year. This allows him to see the classroom before he is actually part of it. Allow him to explore the area and ask any questions about its set-up and materials.
Meet with your child's teacher before the beginning of the year. Discuss any special concerns you have regarding your child's behavioral or academic needs. If the teacher is willing, bring your child along to this meeting.
Enlist the help of your child's new teacher and ask her to assign your child a peer partner from her current class. Allow your child to meet with the assigned peer and ask any questions about the new class.
Role play the child's new primary classroom routines using stuffed animals or dolls. For example, if the child's preschool class does not go to the cafeteria for lunch, use these dolls or stuffed animals and pretend to go to the cafeteria. The stuffed animal can be "taught" to get its tray and food. Use this technique for any new routines your child may encounter in his new classroom. Correct any behavior you wish to using the stuffed animals. Your child will then translate these concepts into his new primary classroom.