Having pepper spray in school is illegal and can get you suspended from school if you're caught carrying pepper spray.
Pepper Spray is considered a weapon in school and pepper spray is also a controlled substance which is illegal to have on school grounds.
Having pepper spray in your possession on school grounds can get you suspended and may even get you arrested.
There was a student I read about that got suspended for having pepper spray on them for protection.
But the student got into trouble for the pepper spray being in their possession because it is a controlled substance.
You might get away with bring pepper spray to school but then again you may not.