This group of exercises takes you up to “Ludicrous B”, the highest note that can be fingered on a standard 19-fret classical guitar, located on the fifth ledger line above the staff. Flute players routinely sight read music this high above the staff and guitarists can too. See the section on “Hairy Notes Outside the Staff” for tips on sight-reading in this range.
“First finger E on first string” (the octave of open first string) locates position XII, while “first finger E on fourth string” locates position XIV. The high notes on string ① are doubled two octaves lower to help with learning their names (two octaves preserves their line/space appearance and allows you to mentally imagine the high note minus its first two ledger lines with the remaining ledger lines representing the lines of the common treble clef).
Scale 19. Two octaves in Aeolian thirds covers twelfth position.
Scale 20. Phrygian footwork reaches Ludicrous B.
The boxes below automatically keep track of which exercises you've seen in this group (you get a white star for each exercise you visit). And clicking on a box will take you to that exercise (you can see the exercise number by hovering over a box and looking at the url displayed). So all this lets you pick up where you left off in your last session, or go on to some random exercise you haven't seen yet. Courtesy of your browser history.