Children in a Yeshiva? That could have been a horror show.
I always thought that a Yeshiva was a university-level school for Rabbi’s. I formed that impression years ago, when I had a housemate who graduated first in his class from a top Yeshiva in NYC, but then decided he wanted to be a Christian rather that a Rabbi.
I think it’s more of a religious-oriented Jewish high school.
Yeshiva is a Jewish religious school, and can teach students at any level, including elementary.
https://en.wikipedia.org/wiki/Yeshiva