A knife may not be allowed, but it also isn't necessarily the best tool for the situation either. I'd be willing to bet basic tools are still availible to you: a flashlight, EMT shears, a small screwdriver set (the type with a plastic handle with multiple bits stored in side), a pair of pliers and a flashlight.

In addition, I'd carry a small first aid kit. I generally carry a few bandaids, but mostly a roll of first aid tape, some large gauze pads and a triangle bandage. A small kit, but one geared towards more severe injures.

In the event you're trapped in a collapsed building a whistle is your best bet for signalling rescuers. Any of the high quality pealess whistles is a good choice, just check out the ETS homepage.

Finally, consider the possiblity that you may be spending the night at the school in the event of a major disaster. What do you need to be comfortable (or atleast not very uncomfortable) over night?

Good question.