Proper nouns are names of specific people, places, or things. They are always capitalized.
Here are some examples of how to use "school" as part of a proper noun:
* School Name: "I went to Oakwood School."
* Specific School: "I'm going to the school down the street." (This is a proper noun because it refers to a specific school, even though you don't know its name.)
Important Note: If you're talking about the concept of "school" in general, it remains a common noun and is not capitalized.
* "I like going to school." (This refers to the general concept of education.)