Consider contacting the school early to see if you can go in with your child to meet their new teacher, see their new classroom and perhaps even their seating arrangements. Familiarity of their new space may help ease the anxiety of the ‘new’ school year.
For some great strategies and resources to support your child with Autism, click here: https://familyedcentre.org/categories/parenting-a-child-with-autism/
For resources to help support a child with anxiety, click here: https://familyedcentre.org/anxiety-help-for-children/