*Inherited*, great.... Try a book by the title of Essential Elements. If you think its too easy then try Essential Technique. They're pretty good solo but even better with an experienced player. If those are still to easy then try Symphonic Band Technique. That's a book that he can grow with. It has excercises that are challenging but others that are for the begginner. Added bonus, all of the major and minor scales (plus chromatic) are listed in this book. Hope this helps!