Final answer:
If someone you don't know asks where you go to school, politely decline to answer and change the subject.
Step-by-step explanation:
If someone you don't know asks where you go to school, it is important to prioritize your personal safety and privacy. The best course of action would be to politely decline to answer and change the subject. It is not recommended to provide detailed information about your school and schedule to a stranger, as this could potentially put you at risk.