I like Ludwig Milde’s Twenty-Four Scale and Arpeggio Studies, op. 24. These etudes are great for daily maintenance and workout. I don’t know what it is, but I really like #8–it’s probably because the upper middle register slurs are good vitamins, especially in D major!
IMSLP has a link to the Sibley Library copy of the the Hofmeister edition of Milde op. 24. There are a few wrong notes in this edition (easily corrected), but it’s nice to have a convenient electronic copy for your bassoon music archive.