The Lennie Niehaus books "Jazz Conception" are good too. I did those, Rubank (Selected Studies and Advanced Method), Rhythms Complete and Klose 25 Daily Exercises in high school. That was 30 years ago but I still use them with my students now. Some of the newer series of books I have used are "approaching the Standards" and "Jazz Conception" by Jim Snidero. I didn't do Ferling or Viola until college. I love the Viola books but I have yet to meet anyone who has ever done volume 3!