But I would also add classes about ethics.

a branch of philosophy.

Should be. 1 years worth.
You get history. Philosophy. Art. Ideas. Etc.
Excellent stuff. I was top grade in my college class all 3 quarters.
My time in college are some of my happiest most self satisfying memories.
I would go back at 60.

Philosophical study could be one component of many in this endeavor. People graduate from high schools and colleges with their heads full of facts. An absurdly small percentage of them seem to be capable of analyzing both learned facts and new data to improve and inform themselves and the world.

For example, in the Geometry class I had as a HS sophomore, we studied formal logic all through the process. Philosophy was also a topic in English, History, and Civics classes on a regular basis. That's what a balanced education is all about.

Because you can't grade philosophy on a Scantron form, and that would reduce the potential to monetize these children.

Although for me, coincidentally, every psychology or philosophy class I've ever taken was terrible. In high school the teacher of my psychology class made us arrange our desks in a large circle and tried to force us to talk about our problems or whatever; we spent most of the semester in uncomfortable silence while the teacher smirked, then he tried to make us write journals. We learned nothing about psychology. In college my Philosophy 101 professor was a crusty old Christian who actually notified my father, concerned, when I wrote my final paper on Bertrand Russel's "Why I Am Not a Christian." Then I took a class on existentialism wherein the prof held up a Diet Coke and asked if it was real, that sort of thing. I was distracted because I knew from campus gossip that this guy was having a hot & heavy affair with a student, and there was a woman auditing the class who I suspected was the hot & heavy because the prof never looked at her, ever, and she was gorgeous, a breathtaking music major.

I love Voltaire, Schopenhauer, Sartre, but the heavy stuff gives me a headache. And I always think, oh sure, you have a lot of time to think and write because someone else is doing the cleaning, shopping, cooking, etc. In this way I admire Buddhism because cleaning the toilet is seen as the same importance as meditation.