The only way anyone might get involved in a ground exam might be after 10 years away from flying altogether and then only to get an R/T licence.
Nobody asked me to do one
(after 13 years).
The club wanted me to do Air Law to show that I'd learnt the new rules (which I did), and Human Factors because it hadn't existed when I originally got my PPL (in the end they never got round to asking me to take the paper). But the CAA asked for nothing at all, and the new licence came with the R/T on it.