Closed Slurs in Groups of Six and Rhythmic Accents. Slurs (hammer-ons, pull-offs, in sextuplets) from page 89 in my technique book. Try to emphasize rhythmic groups of three in your accent pattern and follow the usual left hand technique advice of playing with curved fingers, on the fingertips, near the frets, etc. YouTube Lesson Link.
This exercise is from page 89 in my book Classical Guitar Technique: Essential Exercises, Scales, and Arpeggios. The 122 page book includes: Practice Routines, Tips, 100 Open String Exercises, 120 Giuliani Arpeggios, Scales, Slur Exercises, Shifts, Finger Independence, Barre, Tremolo, Common Harmonics, and much more.