I've been asked to send PPL students on their first solo after they had done 5 hours of circuits but never been taught any of Ex.6-10.
Then surely as an Instructor, it is your responsibility to ensure that they meet all of the requirements for solo flight. You check the training records to see what they have done so far and how well they have performed. Ask the candidate what they have done and then brief them on all of the requirements for solo flight including holding a valid medical certificate. In this case it would seem they have another 6 hours to do before even thinking about it.