To get fast and consistent improvement, use the progress charts when working on harmonic slurs, single and multiple tonguing.  Simply tick a box or 2 every day to improve efficiency dramatically.  Print out many charts and write down exercise on the top i.e. Eb-Ab Harmonic Slur or Triple Tonguing of first space F.

progress-chart

Progress Chart Instruction:

  1. Fire up your metronome
  2. Fill in as many boxes as possible (may take a while on the first day).
  3. Simply aim to tick one or two boxes per day (one longer duration, one faster tempo)