The Real Face of Xavier's
The primary purpose of Xavier's School is to provide a safe haven for mutants young and old to learn how to control and refine their abilities. Xavier's ultimate goal is a world where mutants and non-mutants live in a peaceful, integrated society, and he sees education as the primary tool for accomplishing this. Under his eye, young mutants learn to accept their abilities and to use them to benefit both themselves and the world around them.
So, in addition to physics, a student might find themselves sitting down to Introductory Psionic Theory, Phys Ed includes a self-defense component in addition to dodge ball, and friendly pick-up games of soccer out on the lawn include the addition of "powers or no powers" to the set-up rules. Beyond that, Xavier's School remains very much a school full of teenagers like you might find anywhere else.
Except for that jet that lives under the basketball court.
New students are not immediately told by the faculty that anything interesting and superhero goes on, but there is little point to trying to silence the rumors. A student who's been at the School for a year or so probably knows all about the fact that some of the faculty are what the other kids have dubbed "X-Men", that there is a place called the danger room and what it does, and that stuffy old Professor Summers actually flies a pretty bitchin' stealth jet.
On the security front, Xavier's School is probably some of the most unobtrusively-monitored and guarded property this side of the White House. While everything is slanted with an eye towards subtlety, the gates and the exterior fence have cameras, scanners and monitoring equipment installed to create a solid perimeter. The woods around the mansion are sprinkled with still more cameras and sensors. The lower levels of the school, in addition to featuring myriad escape tunnels, can also be locked down to create an emergency bunker with emergency supplies to feed the students and staff for three weeks. The medical bay can be converted to Biohazard Level 3 standards with the press of a button, and Biohazard Level 4 (The level that Ebola Virus is classed at.) with a few hours' prep time. Access to the Danger Room, Cerebro chamber, Blackbird hangar and, if necessary, the medical bay is restricted.