Some of the suggestions are just to stealthy or MacGuyverish for me (geocaching your 12 inch knife off campus etc, fire from steel wool etc). If something happens while you're at school things may be intense - the last thing that your school administrators need post-event is to think their kids have gone all Lord of the Flies with 12 inch Bowie knives. Not only will you need your supplies, but the school will need some cool heads. While a knife is essential in alot of scenarios, you still haven't shown anyone what you would use if for in La Jolla afer an event, probably an earthquake. To be frank, schools rely on simple tests and knowledge building to assure themselves you can handle it responsibly. (That's why they prohibit knives generally).

Be up front, and get involved. As others have suggested talk to your principal and the administrator of your school's preparedness program. See if there's a role in it for you as something other than a bystander. Look over their supply list, get involved with the inventory and drills, make some suggestions. You may not have access to your locker post-event. Many schools have their emergency supplies stored away from buildings (20' or 40' shipping containers, out-buildings) - see about storing your own supplies there, including items not ordinarily allowed. Get others involved in getting ready. I can't think of many preparedness efforts that won't accept willing hands, at least in preparation.

At 13 years though they won't likely plan for you to assist post-disaster unless you demonstrate real leadership and some training. You'll be 25 miles from home - your first 24 hours will likely be at the school, you could spend that time helping out. Don't be too dismayed if you get brushed off as just a kid - it happens to adults preparing alongside the professionals (disaster, police, fire). Keep chugging - the police or fire may do CERT or similar training, or auxiliaries to get involved with. If the school doesn't involve you, look to get involved in broader community disaster preparedness efforts. As a Scout you can turn all this effort into a nice community service project. Keep in mind that even if others can't plan for you to assist after an event, you'll at least be ready, which is a huge relief for everyone.

Now that I look at it, even this is alot for a teenager - don't forget to have some non-ERP fun now. Do you homework too, okay?