Be careful. Tools like EMT shears or pliers carried in a teenager's book bag are unusual and can be misconstrued. E.g. pliers are used to try and remove the anti-shoplifting tabs from merchandice. EMT shears are used to cut open the clear plastic packaging around things like video games so they are more compact and easier to hide.

It's possible that in the wrong circumstance, these tools could be considered "burglary tools" which could be a huge headache and possbily lead to arrest, just for possessing these tools in the wrong situation. Hang out with your friends at the mall after school, one of your friends is dumb enough to shoplift and get caught, you all get taken to a back room, they find these tools in your backpack...and that's a bad situation to be in. Even having tools in your locker would be unusual, in my opinion, although less likely to cause problems than having them on you. Hope your school doesn't have metal detectors if you decide to keep some tools!

I agree with the other posters that for someone in middle school, the first priority is to find out how you fit into your parents' and your school's preparedness plans first, then see where you might improve things or fill in some gaps. An example of a gap might an earthquake that hits while you're going to and from school, where you aren't under your parents' or school's supervision, so that might be one area to think hard about what you're going to do and what you might need.

Good for you for thinking about these things, though.