If by Bill, you mean me?

It is my understanding that The FAA no longer considers a pilot with a certificate, a student. They are a rated pilot in search of additional ratings.
Hence they do not require a written test going from airplane to glider. As shown in other posts on RAS, the way to be considered a student is to turn in all your certificates and start from scratch, a student, complete with written tests and student limitations,

BillT