Tangentially, and making a thread all about Ben again, I have a little "good school / bad school" experience myself, albeit it all in the public school space. In Elementary school, I was pretty much a straight A student, always being picked for whatever they called the "advanced placement" classes back then. Part of that was because my parents, besides things like my dad teaching me to read at 3 by using encyclopedias instead of kids books, was them working multiple jobs to get us money to move into a neighborhood where there were good schools.
Then in the 7th grade, me and Kamala were both put on buses. Hers went to good schools. Mine went to the worst junior high school in the city in the worst part of town. But hey, it was diverse, and as a white kid, it was what I deserved. I got beat up a lot. That was only one of the things that caused my grades to drop. And drop and drop. I became a C student for most of Junior High. It wasn't for wont of intelligence, and I'm not trying to brag, but I have a 151 IQ, and was always reading and doing experiments as a kid just for fun. That intelligence didn't disappear in Junior High, but I had no desire to apply it there. One of my first beatdowns my first month there was not letting a Mexican gangbanger cheat off me in math class. He and his buddies jumped me at lunch and beat the crap out of me. I didn't see the point in being a "good student".
For High School, I got to go back to the one my parents worked to get me to, but I never became more than a B student, which, looking back now was because my younger self never got past my terrible junior high experience. My attitude was that school sucked and was a waste of time. I mean, I recovered, in that after high school I did blue collar stuff learning life lessons, and went back to college later in life with the same dedication and interest that I had in elementary school. But I could have just as easily continued the downward slide from junior high.
There is no education through diversity - at least in the direction of "good schools are bad for equity". It will only create worthless people. An "underrepresented student" may have a chance to do better being put in a good school, but taking a white kid out of a good school and putting them in a crap school to "even things out" won't lift up the bad school, it will only drag down the student.