Well, first off, get him a little orange vest so that people will be able to see him when he's crossing the street. Teach him to look both ways before attempting to cross and I would follow behind him for the first couple of days to make sure he doesn't get lost on the way to school. Then, go to the school and wait for the last bell to ring and follow him back to make sure the little fella can find his way home.
Now, your going to need to teach him to whistle a tune, so he can entertain himself on the way to school. "This is also helpful to scare away any kitty cats that might live somewhere along his school route". They do get hungry, ya know.
Then, when he gets home, give him a pat on his little head and tell him what a big boy he is getting to be.
PS, you must be plenty proud of your little guy because i hear that Purbeck high is a very elite school for genius's!