Try some Articulation excersises (staccato arpeggios and other stuff) your articulation can never be to good, try some phrasing ecxersises, and have him play all major and minor scales, if he plays right through that stuff, see what he wants to play, everybody is interested in Altissimo so give him some overtone stuff, he probably would be interested in some "slap-tongueing," or circular breathing, if he likes jazz you got to teach him to growl (can't call yourself a jazz saxophonist and not know how to growl). Just show him some more options of things to practise, make sure he's got the general idea, and that's about all you can do for him. The rest is up to him.