* It's a small, less-known school: Many smaller schools don't have a strong online presence.
* The name is slightly different: Perhaps the name is similar but not exact.
* It's a fictional school: It could be the name of a school in a book, movie, or game.
To find out if it's real, you'd need to provide more information, such as:
* Location (city and state): Knowing the general area would help narrow down the search.
* School district: If you know the school district, you can check its website for a list of schools.
Without more details, it's highly unlikely that "Columbia North High School" is a real, established high school.