They don’t need his report card, unless he misses the age cutoff for 2nd grade. If he is 7 before 8/31, they are legally required to enroll him if you can prove residency. If he misses the cutoff date, then yes, you will have some hoops to jump through.
If you have signed a lease on the place in SS, I would enroll him in that school and suck it up and drive him until you move in (if you can).