I have never heard of this in my life, and I have no idea if my school does that. US student if that matters. I’ve either done exams online (but logged in), in person, or just had a final project that served as an exam. Hell, even popular HS exams like the PSAT and ACT should have our names on them, as far as I remember. Like maybe when they grade them via scantron they don’t see it, but idk.