The first time in a new classroom is easier when it is not also the first day everyone else is there too.
Most schools will arrange a short visit outside normal hours if you ask — an empty classroom is a completely different experience from a full one, and it gives your child a chance to look around without twenty other children also arriving for the first time.
The specific door, the specific corridor, where the coat pegs are, where the bathroom is — walking the literal path removes one more unknown from the actual first morning. Generic reassurance about "a new school" does not do this; the physical walk-through does.
Take pictures of the classroom, the teacher if they are there and willing, the entrance, the playground — these become the material for a visual schedule of the new place, which does more good used repeatedly in the days before term than the single visit does on its own.
Ask if you can see the classroom at pickup time when it is emptying out, or request photos from the teacher directly. Some exposure to the real space beats none.
If the teacher is available and willing, yes — even a short, low-pressure hello lets your child attach a face to a name before the first day, which matters more than it sounds like it would.
A child managing well with a new routine one year does not guarantee the next transition is easy. It is a low-cost thing to keep doing regardless.
Part of our guide to Visual supports & routines.