re: What schools would ST. George affect?

How good are you at the lottery? That's literally how you're going to get into BR High, unless you fit their demographic. Seriously, if you're "planning" to send your kids there, you should
(a) know that thousands of other parents are too and there is not close to enough room in the only non-horrible high school in EBR, and
(b) you should start planning to afford a private school for the years your kids have to attend while they play the lottery for subsequent years.
Or you could help St. George incorporate so we can enjoy a Zachary level of education (what? No magnet in Zachary? Just among the best in the state?)