or can i use homeKit in school, classroom, or someelse place where is not HOME.
can i use homeKit in office, does it against the policy of apple?
I don't think there are any restrictions on where or for what to use HomeKit.
But when you develop a HomeKit accessory, it should be related to Home Automation - otherwise it won't be approved.
For example, technically you could use HomeKit to control accessories in your car - e.g. opening the door, turning on the light. But I don't think Apple would approve that kind of accessories.