My first cuatro song: Teacher plays the chords for the student. In these exercises student is allowed to use a plectrum or fingers to play the notes. Pay attention to playing rhythms correctly using a metronome really helps.
Stop switching the rhythms: In this exercise there are alternating rhythms pay attention and use the numbers to count exactly where the notes need to be played.
Why is everything sharp : Refer always to your cuatro diagram, this piece has an A# introduced and is a key component in the piece.