I think it's reasonable for the school to impose such a curfew, especially of 10:30. Sure, the security guards COULD unlock the gates and let you in after curfew time, but obviously the director of the school doesn't want them to do that, and for good reason, I bet.

When I was taking my TESOL course in Thailand, I was awakened on several occasions by the ever-present alcoholic students staggering into the center at all hours of the early morning completely oblivious to their own ruckus and the clock on the wall. I got tired of that bull## real quick. I bet your director has seen that crap as well, and is simply trying to eliminate it. If you're coming in past curfew, you're probably drunk, at least in his eyes, and he doesn't want you entering the campus. You have to understand where he's coming from on this.

I think he's in the right. Accept it or fly the coop.