Let’s put it this way. High Schools collect a lot of demographic information on their students along the way. It’s unusual if the records don’t indicate whether parents went to college or not. The GC has to write a letter on each student. You can be sure that part of the letter has to do with whether a student is first gen or poor. GCs make it their business to know something about the kids they write letters for. They know colleges are looking for first gens, and they are smart people who aren’t generally fooled.