On the previous pages the chord was given first followed with the arpeggio for each combination. Go back and play just the chord sounds.
Playing all of those chords on the guitar gives some flexibility.
Singing all of the arpeggios gives ear training and solfeggio skills. Picking the notes of each arpeggio, as played back, will give you some picking skills, or use fingerstyle playing for the right hand.
If you move everything up a fret, or down a fret, and sing along with syllables, that will give some ear training in hearing the primary chords used.
Singing a single syllable/consonant combination on a single pitch. When repeated it moves chromatically up in increments of half steps. Example. Ma, Me, May, Mo, Mu. It is a sort of rapid monotone sound for each tone. Gets your tongue to move. Diction improvement in pronouncing syllables and words. Perhaps having a thought of over pronouncing words is another way of making words clearer.
Try singing the syllables with the following sounds from the diagrams. Run this thru the entire octave ascending using the following sounds given in the diagrams below. If it gets out of your range, then drop you voice an octave to the next lower note that has the same sound only lower in pitch.