Learn the Chromatic Scale and practice it regularly
(i.e. semitones all the way up).
Bottom 4 notes are really hard.
‘O’ shaped embouchure for Bb, B, C C#
‘ee’ shaped embouchure for D and upward
‘eh’ shape on upper register (8:18)
May need more shape and control to get well supported notes in upper register
High D# is 2 left-palm keys
High E uses the top right-palm key
High F uses all 3 left-palm keys as well