Are there really schools that have so many undocumented students they would close down if the majority of undocumented people were deported, or is it a bunch of racist nonsense?

I'm told that "if Trump gets rid off all the illegals entire city schools would shut down". I've heard this about Queens and Dallas. Not all the schools in the city, but an entire school building. The people saying this could easily think anyone "brown" is undocumented.

I'm curious are there any schools in America in which the majority of the students are undocumented?