From OpenStreetMap Wiki
How to add schools in openstreetmap ?
Tags for the relation
Each way making up any single state highway route is added to a relation and that relation is given at least these tags:
- name=Name of the School
- name:ml=Name in Malayalam
- addr:postcode= Postcode
CSV file for the above data can be found at: https://github.com/Vonter/kerala_schools