My son did change his major – under the college radar. He entered as an engineering major, all along intending to be a pre-med. I don’t know what he was thinking, probably that it would look cool on the application and he can manage the double curriculum. He got merit money from the engineering department. Pretty soon DS realized it was a mistake, once he was placed into advanced physics class without ever taking physics in HS. He did surprisingly well, but totally hated it and decided it was not worth it. I begged him not to tell the school as long as he could, but when he came out he lost the scholarship.