A school's main objective is whatever they say at any given moment to you. You've got mission statements, brochure advertisements, orientation presentations, presentations to high schools, whatever is said in private from your guidance advisor. There will be PLENTY of times when you hear that they are focused on "preparing you for the real world" or they talk about growth. Funny as vague a language they might use, I've never once read a university (and I've worked at two of them) say that their main objective ISN'T to make you employable.
An education's main goal is not to make you employable.
A school, on the other hand, charges tuition, and therefore any transaction between the student and the school must be viewed under the lens of a financial transaction.