My first answer was incorrect. Collection guideline change from time to time and the guidelines for pre-schools changed in August: August 2015:
The current status is preschool features that have been verified do not need to be deleted. **Preschool features that have been deleted do not need to be rectified at this point in time**, as the school data will be updated and the preschool data will be more complete.
My suggestion is to spend your time on schools other than preschools at this time. Thanks.