I don't doubt it, but the good experience is not unique to racial/cultural diversity, nor a result of it. There could have been any mix of students and you probably would have got a comperable result.
Or maybe not.
It's raining and won't stop.
Just listening to her friend from Haiti was quite an education in and of itself.
She learned things from other kids that could never be learned from a textbook.
She works in a world with people of different cultures and they are not alien to her. She is at ease and that's a good thing.
Needless to say, it cost a small fortune to send her to that school but it ws worth it.
There ws not a single minority in the public school, but there were drugs, guns, and bullying.