I am not a runner so the runners on this board probably know better than I, but eating carbs the night before a race only helps if you have been eating low-carb for at least a week before the race. Also I have read that "carb-loading" is really only necessary/useful/beneficial for long-distance runs.
Carbs themselves aren't blanket "bad" for you. It's just that people eat them in such huge quantities, beyond what is necessary, that the body stores the excess as fat, the up-and-down of the sugars is hard on the organs, etc.
If you eat a lot of carbs you are probably functioning on way lower energy than you could be, but you are so used to that being your baseline that you don't feel tired. It feels normal to you.
If you are doing track at school my guess is that you're doing shorter races/sprints, and you're eating Cheez-Its between those events. IMO you are not running enough distance to justify the snacking between races (or at least no the snacking of that type), if you're thinking it's "carbing you up" to help with your races.
I'm wondering what your track coach has to say about diet. He/she would be a good person to ask, to get starting information, and then put that together with what you hear from other sources.
I would suggest getting your diet together overall (Chris Salvato is the man to ask for this... read the threads on this forum about constructing a proper training diet as a starting point), and then seeing what tweaks you need to fuel your track season.
I am not a runner, but my diet during my performance season is a combination of Zone and Paleo. On performance days I usually have sushi for dinner, actually; although it is usually only one or two rolls and the rest are sashimi. I always have a tomago (egg) too, for extra protein. During long rehearsal days I keep some Greek-style plain yogurt, or a whey protein shake handy to sip on when my energy flags, and also some fruit if I need a quick "zap."
I'm certain track runners have different dietary needs from ballet dancers but I wouldn't be too surprised if they weren't that far off. Both types of athletes tend to work in spurts of quick, focused energy rather than heavy work or sustained movement.
I suggest the following for you to have handy on race days for snacks, but again, check with your coach and if others reply to this thread, their advice is probably better taken than mine, as they are more experienced with running than I am:
--yogurt (Greek-style has the most protein, plain or low-sugar varieties are far better for you)
--string cheese sticks
--whey protein shake made with water or milk
--beef jerky
--fresh fruit
--tomato or vegetable juice
--boiled eggs
...hmmm, I'm trying to think of what else I have posted for people in "snack" threads that have come up.
Essentially any snack you eat should have a combination of protein, carbs, and fats. If you are eating between races, make sure it is something small and easily digested, and also make sure you are eating only when you are hungry. If your body is busy trying to digest it can't focus wholly on your running. Unless you are eating pure sugar (which is a dumb idea), it's really not possible for the energy in the food you've eaten to be accessible enough to your body to give you a "speed/energy boost" during the race. And in all honesty I don't think it would make that much difference anyhow.
You're better off having a clean, appropriate training diet overall for your season, which will enable your body to use its fuel more efficiently so you can run better. It's not like certain foods work like hitting the "Nos" on a car (or whatever you kids call it these days)

Anyway, that's my untrained opinion as someone who loves food and is passionate about wellness/healthy living. I hope someone with more education and expertise than I comes along to debunk any of this that could mislead you.
In the meantime I hope it's helpful/useful.
Oh, PS: cheese and yogurt need far less refrigeration than people think, so those items should be fine for you on race days. As to the eggs (or even the cheese and yogurt), if you keep them in a lunch bag with a cold pack, they should be fine, so no need to worry overly much with refrigeration.