Luke should keep on practicing “Don’t let me down”. Now his focus should be on the Verse. He should pay attention to the preparation to the verse: an extra beat is introduced in the last measure of the chorus. This 5-beat measure will remain as the last one of the repeating verse progression, except when this last measure precedes the next part (chorus). In this case the last measure will only have 4 beats.
Matias should keep on practicing “My my hey hey”, now singing the lyrics along it while playing the guitar part. He should also play exercises 25, 26 & 27 at page 56; and “Mary don’t you weep” at page 57 of the Hal Leonard book.