Answer:
for me, wearing comfortable clothes to school helps because when I have a panic attack, comfort like hoodies really help calm me
I also bring gum, chewing on it, and counting how many times I've chewed helps (this varies depending on your teachers rules)
fidget toys help with people with adhd, but also with ppl with anxiety, so I suggest bringing something small and not too distracting (I dont reccomentmd anything loud, flashy, or anything that could make a mess)
and a breathing exercise I constantly use is "the square breath"
-first, think of a square.
-and start at the top left corner of the square, and breathe in through your nose
-breath in from top left corner to the top right corner
-hold it from the top right corner and go down to the bottom right corner
-slowly breath out from the bottom right corner to the bottom left corner
-and continue breathing out from the bottom left corner to the top left corner
-then, repeat the process as many times you need!
I rlly hope that helps!<3