Schools are in ZONES.. there are many other post on here about schools...do a search
West of the turnpike is the RED zone.. East of the turnpike is the BLUE zone.
you do not go to the closest school to your house and at this time you will most likely get what is available
The school dept will not even talk to you if you dont have an address..
http://www.stlucie.k12.fl.us/