I graduated from there 25 years ago. Definitely designed for the upper crust...mostly. The reason I could attend there was due to the financial aid my family was offered. Paid for half of the tuition (at the time, it was more expensive for me to go to FWCDS than A&M, even with the aid). Don't know if this is still the case, but when I was there, just under half the kids got some sort of aid.
Geared more for the liberal arts than sciences, but by no means is their science program inferior. Class size allows opportunities that most other kids do not get (for instance - varsity athletics and cultural arts required at the same time). But the education there was top notch and as a college prep school, made my years at A&M easier than most. This last year the senior class had 14 Eagle Scouts out of a class of 99. Impressive.
The headmaster there was the HS principal when I was in school. He runs a good ship and has the school flourishing. Great opportunity if you can get in.