One of my kids attended a very demanding high school, a boarding school, actually. During senior or possibly junior year, this youth showed me his AP European History thesis. The master had written on top, in the usual red ink, "Best AP European History thesis I have read in ten years. Almost publishable. B+"
I believe he understood the compliment. The master believed that, however fine and well-researched the work was, he could have taken it even further.
From The Unteachables: A Generation that Cannot Learn - The greatest tragedy of progressive education is not the students' lack of skills, but of teachable character.
“An A,” she said jubilantly, but with a strong undertone of derision. “And I didn’t even read the book!” As the paper thudded into the trash basket, her friends joined in the disdainful laughter.
That quote is about college, not the local high school. Another quote from the essay:
The person who is never challenged is also never refined, never learns to cope with the setbacks that come on the way to high endeavor. And it is not only in the academic realm, of course, that they may be hampered: a full life outside of university also requires the ability to confront one’s weaknesses and recover from defeat. Despite the admittedly important emphasis on character formation in our schools — on tolerance, anti-racism, refusal of bullying, and so on — it seems that we have failed to show students what real achievement looks like and what it will require of them.
Colleges have become high schools. As far as I have heard, only the elite boarding schools still maintain the highest expectations and standards, far higher than even the most elite colleges.